diff --git a/src/libs/portability/portability.h b/src/libs/portability/portability.h
index 182d31de9..42872d622 100644
--- a/src/libs/portability/portability.h
+++ b/src/libs/portability/portability.h
@@ -243,7 +243,7 @@ PORTABILITY_API int SD_snprintf(char *str, size_t size, const char *format, ...)
 
 namespace portability
 {
-    int rmdir_r(const char *path);
+    PORTABILITY_API int rmdir_r(const char *path);
 }
 
 #endif // _SD_PORTABILITY_H_