diff --git a/esp-hal/src/i2c/master/mod.rs b/esp-hal/src/i2c/master/mod.rs
index 2eb957b1f6..e8f47e3171 100644
--- a/esp-hal/src/i2c/master/mod.rs
+++ b/esp-hal/src/i2c/master/mod.rs
@@ -137,7 +137,12 @@ impl core::error::Error for ConfigError {}
 
 impl core::fmt::Display for ConfigError {
     fn fmt(&self, _f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
-        Ok(())
+        match self {
+            ConfigError::InvalidFrequency => write!(
+                f,
+                "Provided bus frequency is invalid for the current configuration"
+            ),
+        }
     }
 }