diff --git a/utils/bison-c.sh b/utils/bison-c.sh
index 0dcd7ef9d3..489c5957e3 100755
--- a/utils/bison-c.sh
+++ b/utils/bison-c.sh
@@ -21,5 +21,7 @@ ${BISON} -d -ra -o ${OUTPUT} ${INPUT}
 
 PREFIX=`echo ${OUTPUT} | sed -e 's:\.cpp$::'`
 
-test -f ${PREFIX}.h || exit 1
+test -f ${PREFIX}.hpp || exit 1
 test -f ${PREFIX}.cpp || exit 1
+
+cp ${PREFIX}.hpp ${PREFIX}.h