diff --git a/c/wsgup/include/main.h b/c/wsgup/include/main.h
index edbb24c..3c40cd4 100644
--- a/c/wsgup/include/main.h
+++ b/c/wsgup/include/main.h
@@ -1,10 +1,6 @@
 #ifndef MAIN_H
 #define MAIN_H
 
-#ifdef _MSC_VER
-#define _CRT_SECURE_NO_WARNINGS
-#endif
-
 #define NONCE_LENGTH 12
 #define TAG_LENGTH 16
 
diff --git a/c/wsgup/src/main.c b/c/wsgup/src/main.c
index 79c7fed..dc09dcc 100644
--- a/c/wsgup/src/main.c
+++ b/c/wsgup/src/main.c
@@ -1,3 +1,7 @@
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>