diff --git a/tccrun.c b/tccrun.c
index 55fb3d81..620be0d9 100644
--- a/tccrun.c
+++ b/tccrun.c
@@ -234,6 +234,7 @@ static void set_pages_executable(void *ptr, unsigned long length)
     unsigned long old_protect;
     VirtualProtect(ptr, length, PAGE_EXECUTE_READWRITE, &old_protect);
 #else
+    extern void __clear_cache(char *beginning, char *end);
 #ifndef PAGESIZE
 # define PAGESIZE 4096
 #endif