diff --git a/svkbd.c b/svkbd.c
index 661470a..855f0bd 100644
--- a/svkbd.c
+++ b/svkbd.c
@@ -11,7 +11,6 @@
 #include <time.h>
 #include <unistd.h>
 #include <ctype.h>
-#include <err.h>
 
 #include <X11/keysym.h>
 #include <X11/keysymdef.h>
@@ -85,8 +84,6 @@ static void togglelayer();
 static void unpress(Key *k, KeySym mod);
 static void updatekeys();
 static void printkey(Key *k, KeySym mod);
-static char *estrdup(const char *str);
-
 
 /* variables */
 static int screen;
@@ -138,12 +135,6 @@ Bool sigtermd = False;
 static Key keys[KEYS] = { NULL };
 static Key* layers[LAYERS];
 
-char * estrdup(const char *str) {
-	char * tmp = strdup(str);
-	if (tmp == NULL) errx(1, "strdup failed");
-	return tmp;
-}
-
 void
 motionnotify(XEvent *e)
 {
diff --git a/util.c b/util.c
index 176f807..3f3b6f0 100644
--- a/util.c
+++ b/util.c
@@ -16,6 +16,16 @@ ecalloc(size_t nmemb, size_t size)
 	return p;
 }
 
+char *
+estrdup(const char *s)
+{
+	char *p;
+
+	if (!(p = strdup(s)))
+		die("strdup:");
+	return p;
+}
+
 void
 die(const char *fmt, ...)
 {
diff --git a/util.h b/util.h
index f633b51..44a5d83 100644
--- a/util.h
+++ b/util.h
@@ -6,3 +6,4 @@
 
 void die(const char *fmt, ...);
 void *ecalloc(size_t nmemb, size_t size);
+char *estrdup(const char *s);