diff --git a/Source/cmTarget.h b/Source/cmTarget.h
index 631de5558..cc848499a 100644
--- a/Source/cmTarget.h
+++ b/Source/cmTarget.h
@@ -18,6 +18,8 @@
 #define cmTarget_h
 
 #include "cmCustomCommand.h"
+
+class cmMakefile;
 class cmSourceFile;
 class cmGlobalGenerator;