diff --git a/t/unit-tests/generate-clar-decls.sh b/t/unit-tests/generate-clar-decls.sh
index 3b315c64b3711b..abf6a2ea2a615e 100755
--- a/t/unit-tests/generate-clar-decls.sh
+++ b/t/unit-tests/generate-clar-decls.sh
@@ -14,6 +14,7 @@ do
 	suite_name=$(basename "$suite")
 	suite_name=${suite_name%.c}
 	suite_name=${suite_name#u-}
+	suite_name=$(echo "$suite_name" | tr '-' '_')
 	sed -ne "s/^\(void test_${suite_name}__[a-zA-Z_0-9][a-zA-Z_0-9]*(void)\)$/extern \1;/p" "$suite" ||
 	exit 1
 done >"$OUTPUT"