diff --git a/wrappers/clang-target-wrapper.c b/wrappers/clang-target-wrapper.c
index b20f910..7097786 100644
--- a/wrappers/clang-target-wrapper.c
+++ b/wrappers/clang-target-wrapper.c
@@ -46,7 +46,7 @@ typedef char TCHAR;
 #define EXECVP_CAST (char **)
 #endif
 
-TCHAR *escape(const TCHAR *str) {
+static TCHAR *escape(const TCHAR *str) {
 #ifdef _WIN32
     TCHAR *out = malloc((_tcslen(str) * 2 + 3) * sizeof(*out));
     TCHAR *ptr = out;