diff --git a/firmware/target/arm/i2c-telechips.c b/firmware/target/arm/i2c-telechips.c
index fb341c7905..9226617b14 100644
--- a/firmware/target/arm/i2c-telechips.c
+++ b/firmware/target/arm/i2c-telechips.c
@@ -36,7 +36,7 @@ static struct mutex i2c_mtx;
 
 void i2c_init(void)
 {
-    /* nothing to do */
+    mutex_init(&i2c_mtx);
 }
 
 void i2c_start(void)