diff --git a/Makefile b/Makefile
index d248b9d..c1b1812 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ SOURCE = align dbseq main pairs param reads utilities
 OBJS1= $(patsubst %,%.o,$(SOURCE))
 
 all: bsmap
-%.o:%.cpp
+%.o:%.cpp %.h
 	$(CXX) $(CXXFLAGS) -c $< -o $@
 bsmap: $(OBJS1)
 	$(MAKE) -C samtools