diff --git a/src/devices/screen.c b/src/devices/screen.c
index a836a79..888928c 100644
--- a/src/devices/screen.c
+++ b/src/devices/screen.c
@@ -108,6 +108,12 @@ screen_redraw(UxnScreen *p, Uint32 *pixels)
 	p->fg.changed = p->bg.changed = 0;
 }
 
+int
+clamp(int val, int min, int max)
+{
+	return (val >= min) ? (val <= max) ? val : max : min;
+}
+
 /* IO */
 
 Uint8
diff --git a/src/devices/screen.h b/src/devices/screen.h
index e64fa05..3ce25ae 100644
--- a/src/devices/screen.h
+++ b/src/devices/screen.h
@@ -34,3 +34,4 @@ void screen_redraw(UxnScreen *p, Uint32 *pixels);
 
 Uint8 screen_dei(Device *d, Uint8 port);
 void screen_deo(Device *d, Uint8 port);
+int clamp(int val, int min, int max);
diff --git a/src/uxnemu.c b/src/uxnemu.c
index 0ed4b68..a9e67c5 100644
--- a/src/uxnemu.c
+++ b/src/uxnemu.c
@@ -46,12 +46,6 @@ static Device *devscreen, *devmouse, *devctrl, *devaudio0;
 static Uint8 zoom = 1;
 static Uint32 stdin_event, audio0_event;
 
-static int
-clamp(int val, int min, int max)
-{
-	return (val >= min) ? (val <= max) ? val : max : min;
-}
-
 static int
 error(char *msg, const char *err)
 {