diff --git a/build_file.c b/build_file.c
index a2a2a32..1096254 100644
--- a/build_file.c
+++ b/build_file.c
@@ -102,7 +102,7 @@ int main(int argc, char **argv) {
         } else {
             ok = os_systemf(
                 "clang ../src/testing/testing_main.c -o testing.exe -g -I ../src"
-                " -fdiagnostics-absolute-paths -Wno-unsequenced"
+                " -fdiagnostics-absolute-paths -Wno-unsequenced -Wsingle-bit-bitfield-constant-conversion"
                 " -lm -ldl"
             );
             if (ok != 0) return ok;