diff --git a/lib/Fuzzer/build.sh b/lib/Fuzzer/build.sh
index 27c148ad43d..4556af5daf7 100755
--- a/lib/Fuzzer/build.sh
+++ b/lib/Fuzzer/build.sh
@@ -1,7 +1,8 @@
 #!/bin/bash
 LIBFUZZER_SRC_DIR=$(dirname $0)
+CXX="${CXX:-clang}"
 for f in $LIBFUZZER_SRC_DIR/*.cpp; do
-  clang -g -O2 -fno-omit-frame-pointer -std=c++11 $f -c &
+  $CXX -g -O2 -fno-omit-frame-pointer -std=c++11 $f -c &
 done
 wait
 rm -f libFuzzer.a