diff --git a/src/core/lib/support/cmdline.c b/src/core/lib/support/cmdline.c
index 88a65a8e2e1..e5c9f3b84bd 100644
--- a/src/core/lib/support/cmdline.c
+++ b/src/core/lib/support/cmdline.c
@@ -71,7 +71,7 @@ struct gpr_cmdline {
 static int normal_state(gpr_cmdline *cl, char *arg);
 
 gpr_cmdline *gpr_cmdline_create(const char *description) {
-  gpr_cmdline *cl = gpr_zalloc(sizeof(gpr_cmdline));
+  gpr_cmdline *cl = (gpr_cmdline *)gpr_zalloc(sizeof(gpr_cmdline));
 
   cl->description = description;
   cl->state = normal_state;
@@ -100,7 +100,7 @@ static void add_arg(gpr_cmdline *cl, const char *name, const char *help,
     GPR_ASSERT(0 != strcmp(a->name, name));
   }
 
-  a = gpr_zalloc(sizeof(arg));
+  a = (arg *)gpr_zalloc(sizeof(arg));
   a->name = name;
   a->help = help;
   a->type = type;
@@ -302,7 +302,7 @@ static int normal_state(gpr_cmdline *cl, char *str) {
     eq = strchr(str, '=');
     if (eq != NULL) {
       /* copy the string into a temp buffer and extract the name */
-      tmp = arg_name = gpr_malloc((size_t)(eq - str + 1));
+      tmp = arg_name = (char *)gpr_malloc((size_t)(eq - str + 1));
       memcpy(arg_name, str, (size_t)(eq - str));
       arg_name[eq - str] = 0;
     } else {
diff --git a/src/core/lib/support/histogram.c b/src/core/lib/support/histogram.c
index ba8176bb057..c88695409dc 100644
--- a/src/core/lib/support/histogram.c
+++ b/src/core/lib/support/histogram.c
@@ -88,7 +88,7 @@ static double bucket_start(gpr_histogram *h, double x) {
 
 gpr_histogram *gpr_histogram_create(double resolution,
                                     double max_bucket_start) {
-  gpr_histogram *h = gpr_malloc(sizeof(gpr_histogram));
+  gpr_histogram *h = (gpr_histogram *)gpr_malloc(sizeof(gpr_histogram));
   GPR_ASSERT(resolution > 0.0);
   GPR_ASSERT(max_bucket_start > resolution);
   h->sum = 0.0;
@@ -102,7 +102,7 @@ gpr_histogram *gpr_histogram_create(double resolution,
   h->num_buckets = bucket_for_unchecked(h, max_bucket_start) + 1;
   GPR_ASSERT(h->num_buckets > 1);
   GPR_ASSERT(h->num_buckets < 100000000);
-  h->buckets = gpr_zalloc(sizeof(uint32_t) * h->num_buckets);
+  h->buckets = (uint32_t *)gpr_zalloc(sizeof(uint32_t) * h->num_buckets);
   return h;
 }
 
diff --git a/src/core/lib/support/host_port.c b/src/core/lib/support/host_port.c
index f19bdbc8357..bbd42c26e08 100644
--- a/src/core/lib/support/host_port.c
+++ b/src/core/lib/support/host_port.c
@@ -98,7 +98,7 @@ int gpr_split_host_port(const char *name, char **host, char **port) {
   }
 
   /* Allocate return values. */
-  *host = gpr_malloc(host_len + 1);
+  *host = (char *)gpr_malloc(host_len + 1);
   memcpy(*host, host_start, host_len);
   (*host)[host_len] = '\0';
 
diff --git a/src/core/lib/support/string.c b/src/core/lib/support/string.c
index d20b86f7cf7..11297c9ddb9 100644
--- a/src/core/lib/support/string.c
+++ b/src/core/lib/support/string.c
@@ -53,7 +53,7 @@ char *gpr_strdup(const char *src) {
   }
 
   len = strlen(src) + 1;
-  dst = gpr_malloc(len);
+  dst = (char *)gpr_malloc(len);
 
   memcpy(dst, src, len);
 
@@ -74,13 +74,13 @@ static dump_out dump_out_create(void) {
 static void dump_out_append(dump_out *out, char c) {
   if (out->length == out->capacity) {
     out->capacity = GPR_MAX(8, 2 * out->capacity);
-    out->data = gpr_realloc(out->data, out->capacity);
+    out->data = (char *)gpr_realloc(out->data, out->capacity);
   }
   out->data[out->length++] = c;
 }
 
 static void hexdump(dump_out *out, const char *buf, size_t len) {
-  static const char hex[16] = "0123456789abcdef";
+  static const char *hex = "0123456789abcdef";
 
   const uint8_t *const beg = (const uint8_t *)buf;
   const uint8_t *const end = beg + len;
@@ -124,16 +124,16 @@ char *gpr_dump(const char *buf, size_t len, uint32_t flags) {
 
 int gpr_parse_bytes_to_uint32(const char *buf, size_t len, uint32_t *result) {
   uint32_t out = 0;
-  uint32_t new;
+  uint32_t new_val;
   size_t i;
 
   if (len == 0) return 0; /* must have some bytes */
 
   for (i = 0; i < len; i++) {
     if (buf[i] < '0' || buf[i] > '9') return 0; /* bad char */
-    new = 10 * out + (uint32_t)(buf[i] - '0');
-    if (new < out) return 0; /* overflow */
-    out = new;
+    new_val = 10 * out + (uint32_t)(buf[i] - '0');
+    if (new_val < out) return 0; /* overflow */
+    out = new_val;
   }
 
   *result = out;
@@ -201,7 +201,7 @@ int gpr_parse_nonnegative_int(const char *value) {
 char *gpr_leftpad(const char *str, char flag, size_t length) {
   const size_t str_length = strlen(str);
   const size_t out_length = str_length > length ? str_length : length;
-  char *out = gpr_malloc(out_length + 1);
+  char *out = (char *)gpr_malloc(out_length + 1);
   memset(out, flag, out_length - str_length);
   memcpy(out + out_length - str_length, str, str_length);
   out[out_length] = 0;
@@ -225,7 +225,7 @@ char *gpr_strjoin_sep(const char **strs, size_t nstrs, const char *sep,
   if (nstrs > 0) {
     out_length += sep_len * (nstrs - 1); /* separators */
   }
-  out = gpr_malloc(out_length);
+  out = (char *)gpr_malloc(out_length);
   out_length = 0;
   for (i = 0; i < nstrs; i++) {
     const size_t slen = strlen(strs[i]);
@@ -256,7 +256,7 @@ void gpr_strvec_destroy(gpr_strvec *sv) {
 void gpr_strvec_add(gpr_strvec *sv, char *str) {
   if (sv->count == sv->capacity) {
     sv->capacity = GPR_MAX(sv->capacity + 8, sv->capacity * 2);
-    sv->strs = gpr_realloc(sv->strs, sizeof(char *) * sv->capacity);
+    sv->strs = (char **)gpr_realloc(sv->strs, sizeof(char *) * sv->capacity);
   }
   sv->strs[sv->count++] = str;
 }
@@ -278,12 +278,12 @@ int gpr_stricmp(const char *a, const char *b) {
 
 static void add_string_to_split(const char *beg, const char *end, char ***strs,
                                 size_t *nstrs, size_t *capstrs) {
-  char *out = gpr_malloc((size_t)(end - beg) + 1);
+  char *out = (char *)gpr_malloc((size_t)(end - beg) + 1);
   memcpy(out, beg, (size_t)(end - beg));
   out[end - beg] = 0;
   if (*nstrs == *capstrs) {
     *capstrs = GPR_MAX(8, 2 * *capstrs);
-    *strs = gpr_realloc(*strs, sizeof(*strs) * *capstrs);
+    *strs = (char **)gpr_realloc(*strs, sizeof(*strs) * *capstrs);
   }
   (*strs)[*nstrs] = out;
   ++*nstrs;
diff --git a/src/core/lib/support/string_posix.c b/src/core/lib/support/string_posix.c
index c804ed5ded6..2438b18d219 100644
--- a/src/core/lib/support/string_posix.c
+++ b/src/core/lib/support/string_posix.c
@@ -58,7 +58,7 @@ int gpr_asprintf(char **strp, const char *format, ...) {
 
   /* Allocate a new buffer, with space for the NUL terminator. */
   strp_buflen = (size_t)ret + 1;
-  if ((*strp = gpr_malloc(strp_buflen)) == NULL) {
+  if ((*strp = (char *)gpr_malloc(strp_buflen)) == NULL) {
     /* This shouldn't happen, because gpr_malloc() calls abort(). */
     return -1;
   }
diff --git a/src/core/lib/support/subprocess_posix.c b/src/core/lib/support/subprocess_posix.c
index ed653b9c2e2..b9d0796b016 100644
--- a/src/core/lib/support/subprocess_posix.c
+++ b/src/core/lib/support/subprocess_posix.c
@@ -67,7 +67,7 @@ gpr_subprocess *gpr_subprocess_create(int argc, const char **argv) {
   if (pid == -1) {
     return NULL;
   } else if (pid == 0) {
-    exec_args = gpr_malloc(((size_t)argc + 1) * sizeof(char *));
+    exec_args = (char **)gpr_malloc(((size_t)argc + 1) * sizeof(char *));
     memcpy(exec_args, argv, (size_t)argc * sizeof(char *));
     exec_args[argc] = NULL;
     execv(exec_args[0], exec_args);
@@ -76,7 +76,7 @@ gpr_subprocess *gpr_subprocess_create(int argc, const char **argv) {
     _exit(1);
     return NULL;
   } else {
-    r = gpr_zalloc(sizeof(gpr_subprocess));
+    r = (gpr_subprocess *)gpr_zalloc(sizeof(gpr_subprocess));
     r->pid = pid;
     return r;
   }
diff --git a/src/core/lib/support/thd_posix.c b/src/core/lib/support/thd_posix.c
index 2fc23bffafa..16e645ad91f 100644
--- a/src/core/lib/support/thd_posix.c
+++ b/src/core/lib/support/thd_posix.c
@@ -65,7 +65,7 @@ int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
   pthread_t p;
   /* don't use gpr_malloc as we may cause an infinite recursion with
    * the profiling code */
-  struct thd_arg *a = malloc(sizeof(*a));
+  struct thd_arg *a = (struct thd_arg *)malloc(sizeof(*a));
   GPR_ASSERT(a != NULL);
   a->body = thd_body;
   a->arg = arg;