diff --git a/Makefile b/Makefile
index 7802bd4..30a50ed 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
-SRCS := $(wildcard js*.c utf*.c regex.c)
-HDRS := $(wildcard js*.h mujs.h utf.h regex.h)
+SRCS := $(wildcard js*.c utf*.c regexp.c)
+HDRS := $(wildcard js*.h mujs.h utf.h regexp.h)
 OBJS := $(SRCS:%.c=build/%.o)
 
 prefix ?= /usr/local
diff --git a/jsgc.c b/jsgc.c
index cd65b03..d5daa40 100644
--- a/jsgc.c
+++ b/jsgc.c
@@ -3,7 +3,7 @@
 #include "jsvalue.h"
 #include "jsrun.h"
 
-#include "regex.h"
+#include "regexp.h"
 
 static void jsG_markobject(js_State *J, int mark, js_Object *obj);
 
diff --git a/jsregexp.c b/jsregexp.c
index 199fdc2..ecf001d 100644
--- a/jsregexp.c
+++ b/jsregexp.c
@@ -1,7 +1,7 @@
 #include "jsi.h"
 #include "jsvalue.h"
 #include "jsbuiltin.h"
-#include "regex.h"
+#include "regexp.h"
 
 void js_newregexp(js_State *J, const char *pattern, int flags)
 {
diff --git a/jsstring.c b/jsstring.c
index a5dd7a0..fd60c27 100644
--- a/jsstring.c
+++ b/jsstring.c
@@ -2,7 +2,7 @@
 #include "jsvalue.h"
 #include "jsbuiltin.h"
 #include "utf.h"
-#include "regex.h"
+#include "regexp.h"
 
 int js_runeat(js_State *J, const char *s, int i)
 {
diff --git a/one.c b/one.c
index 2193194..b46cccd 100644
--- a/one.c
+++ b/one.c
@@ -21,6 +21,6 @@
 #include "jsstate.c"
 #include "jsstring.c"
 #include "jsvalue.c"
-#include "regex.c"
+#include "regexp.c"
 #include "utf.c"
 #include "utftype.c"
diff --git a/regex.c b/regexp.c
similarity index 99%
rename from regex.c
rename to regexp.c
index b35c248..9b46556 100644
--- a/regex.c
+++ b/regexp.c
@@ -4,7 +4,7 @@
 #include <setjmp.h>
 #include <limits.h>
 
-#include "regex.h"
+#include "regexp.h"
 #include "utf.h"
 
 #define emit regemit
diff --git a/regex.h b/regexp.h
similarity index 94%
rename from regex.h
rename to regexp.h
index 3164a46..92a7fca 100644
--- a/regex.h
+++ b/regexp.h
@@ -1,5 +1,5 @@
-#ifndef regex_h
-#define regex_h
+#ifndef regexp_h
+#define regexp_h
 
 #define regcomp js_regcomp
 #define regexec js_regexec