diff --git a/src/compiler/glsl/glcpp/tests/glcpp_test.py b/src/compiler/glsl/glcpp/tests/glcpp_test.py
index cdc63b3ac2a..8ac5d7cb0a1 100755
--- a/src/compiler/glsl/glcpp/tests/glcpp_test.py
+++ b/src/compiler/glsl/glcpp/tests/glcpp_test.py
@@ -119,6 +119,9 @@ def test_unix(args):
             for l in diff:
                 print(l, file=sys.stderr)
 
+    if not total:
+        raise Exception('Could not find any tests.')
+
     print('{}/{}'.format(passed, total), 'tests returned correct results')
     return total == passed
 
@@ -155,6 +158,9 @@ def _replace_test(args, replace):
             for l in diff:
                 print(l, file=sys.stderr)
 
+    if not total:
+        raise Exception('Could not find any tests.')
+
     print('{}/{}'.format(passed, total), 'tests returned correct results')
     return total == passed
 
@@ -197,6 +203,9 @@ def test_valgrind(args):
             print('FAIL')
             print(log, file=sys.stderr)
 
+    if not total:
+        raise Exception('Could not find any tests.')
+
     print('{}/{}'.format(passed, total), 'tests returned correct results')
     return total == passed