diff --git a/common/stringop.c b/common/stringop.c
index 16d04917e..dcbd16564 100644
--- a/common/stringop.c
+++ b/common/stringop.c
@@ -360,3 +360,7 @@ char *format_str(const char *fmt, ...) {
 	va_end(args);
 	return str;
 }
+
+bool has_prefix(const char *str, const char *prefix) {
+	return strncmp(str, prefix, strlen(prefix)) == 0;
+}
diff --git a/include/stringop.h b/include/stringop.h
index 19a50f237..ffc355cf0 100644
--- a/include/stringop.h
+++ b/include/stringop.h
@@ -40,4 +40,6 @@ bool expand_path(char **path);
 char *vformat_str(const char *fmt, va_list args) _SWAY_ATTRIB_PRINTF(1, 0);
 char *format_str(const char *fmt, ...) _SWAY_ATTRIB_PRINTF(1, 2);
 
+bool has_prefix(const char *str, const char *prefix);
+
 #endif
diff --git a/sway/input/seat.c b/sway/input/seat.c
index 0dd26290e..1b63f625b 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -647,10 +647,6 @@ static void seat_reset_input_config(struct sway_seat *seat,
 		sway_device->input_device->wlr_device, NULL);
 }
 
-static bool has_prefix(const char *str, const char *prefix) {
-	return strncmp(str, prefix, strlen(prefix)) == 0;
-}
-
 /**
  * Get the name of the built-in output, if any. Returns NULL if there isn't
  * exactly one built-in output.