diff --git a/embedding/browser/gtk/src/Makefile.in b/embedding/browser/gtk/src/Makefile.in
index 1860adf1e593..0c1b708edf09 100644
--- a/embedding/browser/gtk/src/Makefile.in
+++ b/embedding/browser/gtk/src/Makefile.in
@@ -77,7 +77,7 @@ CPPSRCS		= \
 		EmbedContentListener.cpp \
 		EmbedEventListener.cpp \
 		EmbedWindowCreator.cpp \
-    $(NULL)
+		$(NULL)
 
 ifdef MOZ_ENABLE_GTK2
 CSRCS           = \