diff --git a/Makefile b/Makefile
index dab6a9c..5fde74d 100644
--- a/Makefile
+++ b/Makefile
@@ -50,8 +50,8 @@ OBJS = cache.o rfc1035.o util.o option.o forward.o network.o \
        helper.o tftp.o log.o conntrack.o dhcp6.o rfc3315.o \
        dhcp-common.o outpacket.o radv.o
 
-HDRS = dnsmasq.h config.h dhcp_protocol.h dhcp6_protocol.h \
-       dns_protocol.h radv_protocol.h
+HDRS = dnsmasq.h config.h dhcp-protocol.h dhcp6-protocol.h \
+       dns-protocol.h radv-protocol.h
 
 
 all : $(BUILDDIR)
diff --git a/src/dhcp_protocol.h b/src/dhcp-protocol.h
similarity index 100%
rename from src/dhcp_protocol.h
rename to src/dhcp-protocol.h
diff --git a/src/dhcp6_protocol.h b/src/dhcp6-protocol.h
similarity index 100%
rename from src/dhcp6_protocol.h
rename to src/dhcp6-protocol.h
diff --git a/src/dns_protocol.h b/src/dns-protocol.h
similarity index 100%
rename from src/dns_protocol.h
rename to src/dns-protocol.h
diff --git a/src/dnsmasq.h b/src/dnsmasq.h
index a3e1ad5..70b5dac 100644
--- a/src/dnsmasq.h
+++ b/src/dnsmasq.h
@@ -56,11 +56,11 @@ typedef unsigned short u16;
 typedef unsigned int u32;
 typedef unsigned long long u64;
 
-#include "dns_protocol.h"
-#include "dhcp_protocol.h"
+#include "dns-protocol.h"
+#include "dhcp-protocol.h"
 #ifdef HAVE_DHCP6
-#include "dhcp6_protocol.h"
-#include "radv_protocol.h"
+#include "dhcp6-protocol.h"
+#include "radv-protocol.h"
 #endif
 
 #define gettext_noop(S) (S)
diff --git a/src/radv_protocol.h b/src/radv-protocol.h
similarity index 100%
rename from src/radv_protocol.h
rename to src/radv-protocol.h