diff --git a/Makefile.in b/Makefile.in
index 11126da5..c3a0ab6b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -48,7 +48,7 @@ clean:
 distclean: clean
 	rm -rf $(DISTCLEAN)
 
-%.o: %.cpp
+%.o: %.cpp Makefile
 	@mkdir -p .depend
 	$(CXX) $(CXXFLAGS) $(INCLUDES) -c -o $@ $< -MMD -MF .depend/$<.dep
 
diff --git a/man/Makefile.in b/man/Makefile.in
index 1f30d922..29fb137c 100644
--- a/man/Makefile.in
+++ b/man/Makefile.in
@@ -7,7 +7,7 @@ MAN1        := znc.1.gz znc-buildmod.1.gz znc-config.1.gz
 
 all: $(MAN1)
 
-%.1.gz: %.1
+%.1.gz: %.1 Makefile
 	gzip -9 <$< >$@
 
 clean:
diff --git a/modules/Makefile.in b/modules/Makefile.in
index 60bad719..0fac5c99 100644
--- a/modules/Makefile.in
+++ b/modules/Makefile.in
@@ -70,7 +70,7 @@ install_metadirs: create_install_dir
 clean:
 	rm -rf $(CLEAN)
 
-%.so: %.cpp
+%.so: %.cpp Makefile
 	@mkdir -p .depend
 	$(CXX) $(MODFLAGS) $(INCLUDES) $(LDFLAGS) -shared -o $@ $< $($(basename $<)FLAGS) -MMD -MF .depend/$<.dep