diff --git a/BUILD b/BUILD
index 2c86b3cb43..68933101fb 100644
--- a/BUILD
+++ b/BUILD
@@ -46,9 +46,6 @@ upb_proto_library_copts(
 
 cc_library(
     name = "port",
-    srcs = [
-        "upb/port.c",
-    ],
     copts = UPB_DEFAULT_COPTS,
     textual_hdrs = [
         "upb/port_def.inc",
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index e23703fcfd..638482d438 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -61,8 +61,7 @@ endif()
 
 enable_testing()
 
-add_library(port
-  ../upb/port.c)
+add_library(port INTERFACE)
 add_library(upb
   ../upb/decode.c
   ../upb/encode.c
diff --git a/upb/port.c b/upb/port.c
deleted file mode 100644
index 9ecf135167..0000000000
--- a/upb/port.c
+++ /dev/null
@@ -1,26 +0,0 @@
-
-#include "upb/port_def.inc"
-
-#ifdef UPB_MSVC_VSNPRINTF
-/* Visual C++ earlier than 2015 doesn't have standard C99 snprintf and
- * vsnprintf. To support them, missing functions are manually implemented
- * using the existing secure functions. */
-int msvc_vsnprintf(char* s, size_t n, const char* format, va_list arg) {
-  if (!s) {
-    return _vscprintf(format, arg);
-  }
-  int ret = _vsnprintf_s(s, n, _TRUNCATE, format, arg);
-  if (ret < 0) {
-	ret = _vscprintf(format, arg);
-  }
-  return ret;
-}
-
-int msvc_snprintf(char* s, size_t n, const char* format, ...) {
-  va_list arg;
-  va_start(arg, format);
-  int ret = msvc_vsnprintf(s, n, format, arg);
-  va_end(arg);
-  return ret;
-}
-#endif