diff --git a/Makefile b/Makefile
index 372f25bdb..055d36ddb 100644
--- a/Makefile
+++ b/Makefile
@@ -473,7 +473,7 @@ gcs_qmake $(GCS_MAKEFILE): | $(GCS_DIR)
 	    -spec $(QT_SPEC) -r CONFIG+=$(GCS_BUILD_CONF) CONFIG+=$(GCS_SILENT) \
 	    'GCS_BIG_NAME="$(GCS_BIG_NAME)"' GCS_SMALL_NAME=$(GCS_SMALL_NAME) \
 	    'ORG_BIG_NAME="$(ORG_BIG_NAME)"' ORG_SMALL_NAME=$(ORG_SMALL_NAME) \
-       'WIKI_URL_ROOT="$(WIKI_URL_ROOT)"' \
+	    'WIKI_URL_ROOT="$(WIKI_URL_ROOT)"' \
 	    'GCS_LIBRARY_BASENAME=$(libbasename)' \
 	    $(GCS_QMAKE_OPTS)