diff --git a/lib/cpp/Makefile.am b/lib/cpp/Makefile.am
index 4bd40fb..2d77a34 100755
--- a/lib/cpp/Makefile.am
+++ b/lib/cpp/Makefile.am
@@ -18,7 +18,7 @@
 #
 
 moc_%.cpp: %.h
-	$(QT_MOC) $(QT_CFLAGS) $< -o $@
+    $(QT_MOC) $(QT_CFLAGS) $< -o $@
 
 SUBDIRS = .