--- a/lib/fuzzer/standalone/StandaloneFuzzTargetMain.c
+++ b/lib/fuzzer/standalone/StandaloneFuzzTargetMain.c
@@ -19,11 +19,16 @@
 #include <stdlib.h>
 
 extern int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size);
-__attribute__((weak)) extern int LLVMFuzzerInitialize(int *argc, char ***argv);
+#ifndef _MSC_VER
+__attribute__((weak))
+extern int LLVMFuzzerInitialize(int *argc, char ***argv);
+#endif
 int main(int argc, char **argv) {
   fprintf(stderr, "StandaloneFuzzTargetMain: running %d inputs\n", argc - 1);
+#ifndef _MSC_VER
   if (LLVMFuzzerInitialize)
     LLVMFuzzerInitialize(&argc, &argv);
+#endif
   for (int i = 1; i < argc; i++) {
     fprintf(stderr, "Running: %s\n", argv[i]);
     FILE *f = fopen(argv[i], "r");