diff --git a/include/grpc++/impl/call.h b/include/grpc++/impl/call.h
index fca56030479..885a1075ad1 100644
--- a/include/grpc++/impl/call.h
+++ b/include/grpc++/impl/call.h
@@ -126,11 +126,11 @@ class WriteOptions {
   }
 
  private:
-  void SetBit(const gpr_int32 mask) { flags_ |= mask; }
+  void SetBit(const gpr_uint32 mask) { flags_ |= mask; }
 
-  void ClearBit(const gpr_int32 mask) { flags_ &= ~mask; }
+  void ClearBit(const gpr_uint32 mask) { flags_ &= ~mask; }
 
-  bool GetBit(const gpr_int32 mask) const { return flags_ & mask; }
+  bool GetBit(const gpr_uint32 mask) const { return (flags_ & mask) != 0; }
 
   gpr_uint32 flags_;
 };
diff --git a/src/cpp/proto/proto_utils.cc b/src/cpp/proto/proto_utils.cc
index be84c222a0e..f47acc8f8dc 100644
--- a/src/cpp/proto/proto_utils.cc
+++ b/src/cpp/proto/proto_utils.cc
@@ -36,6 +36,7 @@
 #include <grpc/grpc.h>
 #include <grpc/byte_buffer.h>
 #include <grpc/byte_buffer_reader.h>
+#include <grpc/support/log.h>
 #include <grpc/support/slice.h>
 #include <grpc/support/slice_buffer.h>
 #include <grpc/support/port_platform.h>
@@ -111,7 +112,8 @@ class GrpcBufferReader GRPC_FINAL
     if (backup_count_ > 0) {
       *data = GPR_SLICE_START_PTR(slice_) + GPR_SLICE_LENGTH(slice_) -
               backup_count_;
-      *size = backup_count_;
+      GPR_ASSERT(backup_count_ <= INT_MAX);
+      *size = (int)backup_count_;
       backup_count_ = 0;
       return true;
     }
diff --git a/src/cpp/util/time.cc b/src/cpp/util/time.cc
index b3401eb26b7..6157a37745a 100644
--- a/src/cpp/util/time.cc
+++ b/src/cpp/util/time.cc
@@ -57,8 +57,8 @@ void Timepoint2Timespec(const system_clock::time_point& from,
     return;
   }
   nanoseconds nsecs = duration_cast<nanoseconds>(deadline - secs);
-  to->tv_sec = secs.count();
-  to->tv_nsec = nsecs.count();
+  to->tv_sec = (time_t)secs.count();
+  to->tv_nsec = (int)nsecs.count();
   to->clock_type = GPR_CLOCK_REALTIME;
 }
 
@@ -73,8 +73,8 @@ void TimepointHR2Timespec(const high_resolution_clock::time_point& from,
     return;
   }
   nanoseconds nsecs = duration_cast<nanoseconds>(deadline - secs);
-  to->tv_sec = secs.count();
-  to->tv_nsec = nsecs.count();
+  to->tv_sec = (time_t)secs.count();
+  to->tv_nsec = (int)nsecs.count();
   to->clock_type = GPR_CLOCK_REALTIME;
 }