diff --git a/libc/string.cpp b/libc/string.cpp
index 5f29280456..5640301400 100644
--- a/libc/string.cpp
+++ b/libc/string.cpp
@@ -146,6 +146,7 @@ char* strndup(const char* str, size_t size)
 }
 #endif
 
+__attribute__((optimize("-O0")))
 size_t strlen(const char* str)
 {
 	size_t len = 0;