diff --git a/components/spiffs/include/spiffs_config.h b/components/spiffs/include/spiffs_config.h
index b245a5d1b5..3281619256 100644
--- a/components/spiffs/include/spiffs_config.h
+++ b/components/spiffs/include/spiffs_config.h
@@ -71,7 +71,7 @@ extern void spiffs_api_unlock(struct spiffs_t *fs);
 
 // Defines spiffs debug print formatters
 // some general signed number
-#define _SPIPRIi   "%"PRIdMAX
+#define _SPIPRIi   "%" PRIdMAX
 // address
 #define _SPIPRIad  "%08x"
 // block