diff --git a/Makefile b/Makefile
index 2e02211..279c1f0 100644
--- a/Makefile
+++ b/Makefile
@@ -48,7 +48,7 @@ run: $(TARGET)
 	@$(TARGET)
 
 test: $(TEST_TARGET)
-	@$(TEST_TARGET) $(if $(TEST),--test-case=$(TEST))
+	@$(TEST_TARGET) $(if $(TEST),--test-case="$(TEST)")
 
 # -------------------------------------------------------------------
 # Link binaries