diff --git a/Makefile b/Makefile
index 9f1b6e8926..c79e8ba759 100644
--- a/Makefile
+++ b/Makefile
@@ -822,12 +822,12 @@ VCSSVN_LIB = vcs-svn/lib.a
 
 GENERATED_H += command-list.h
 
-LIB_H := $(shell git ls-files '*.h' ':!t/' ':!Documentation/' 2>/dev/null || \
+LIB_H := $(sort $(shell git ls-files '*.h' ':!t/' ':!Documentation/' 2>/dev/null || \
 	$(FIND) . \
 	-name .git -prune -o \
 	-name t -prune -o \
 	-name Documentation -prune -o \
-	-name '*.h' -print)
+	-name '*.h' -print))
 
 LIB_OBJS += abspath.o
 LIB_OBJS += advice.o