diff --git a/bin/ruby-build b/bin/ruby-build
index 8d6d4062..07378c5f 100755
--- a/bin/ruby-build
+++ b/bin/ruby-build
@@ -151,6 +151,7 @@ use_gcc42_on_lion() {
   if [ "$(uname -s)" = "Darwin" ]; then
     if [ "$(expr "$(sw_vers -productVersion | cut -f 2 -d .)" \>= 7 || true)" -eq 1 ]; then
       export CC=/usr/bin/gcc-4.2
+      CONFIGURE_OPTS="--with-gcc=$CC $CONFIGURE_OPTS"
     fi
   fi
 }