diff --git a/build-aux/build-cc32.sh b/build-aux/build-cc32.sh
index 6ad2a73f..e1189a50 100755
--- a/build-aux/build-cc32.sh
+++ b/build-aux/build-cc32.sh
@@ -57,6 +57,7 @@ CC32_CPPFLAGS=${CC32_CPPFLAGS-"
 CC32_CFLAGS=${CC32_CFLAGS-"
 -std=gnu99
 -O0
+-fno-builtin
 -fno-stack-protector
 -g
 -m32