diff --git a/tests/file-check-cxx b/tests/file-check-cxx
index 8ece835..4018265 100755
--- a/tests/file-check-cxx
+++ b/tests/file-check-cxx
@@ -2,10 +2,10 @@
 FILECHECK=$1
 CXX=$2
 PREFIX=$3
-ARGS=${*:4}
-SOURCE=$(echo $ARGS | grep -oP '\S+\.cpp\b')
-OBJ=$(echo $ARGS | grep -oP '\S+\.o\b')
-$CXX $ARGS 2>&1 | $FILECHECK -check-prefix=$PREFIX $SOURCE
+shift 3
+SOURCE=$(echo "$@" | grep -oP '\S+\.cpp\b')
+OBJ=$(echo "$@" | grep -oP '\S+\.o\b')
+$CXX "$@" 2>&1 | $FILECHECK -check-prefix=$PREFIX $SOURCE
 if [ "$?" -eq 0 ]; then
   touch $OBJ
 else