diff --git a/Makefile b/Makefile
index e3a1a5113..789695388 100644
--- a/Makefile
+++ b/Makefile
@@ -283,7 +283,7 @@ LINKFLAGS := $(WASIFLAGS) -Wl,-z,stack-size=1048576 $(filter-out -rdynamic,$(LIN
 LIBS := -lwasi-emulated-process-clocks $(filter-out -lrt,$(LIBS))
 ABCMKARGS += AR="$(AR)" RANLIB="$(RANLIB)"
 ABCMKARGS += ARCHFLAGS="$(WASIFLAGS) -D_WASI_EMULATED_PROCESS_CLOCKS -DABC_USE_STDINT_H -DABC_NO_DYNAMIC_LINKING -DABC_NO_RLIMIT"
-ABCMKARGS += OPTFLAGS="$(OPT_LEVEL)"
+ABCMKARGS += OPTFLAGS="-Os"
 EXE = .wasm
 
 DISABLE_SPAWN := 1