diff --git a/CHANGELOG.md b/CHANGELOG.md
index b1d40d97..02678782 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fix wrong frequency reported by `MonoTimer`
 - Fix period retrieval for timers
 
 ### Changed
@@ -22,6 +23,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Improve `SPI` documentation
 - Improve `RCC` and `AFIO` register documentation
 
+
 ## [v0.6.0] - 2020-06-06
 
 ### Breaking changes
diff --git a/src/time.rs b/src/time.rs
index 6d37382b..e69439eb 100644
--- a/src/time.rs
+++ b/src/time.rs
@@ -241,7 +241,7 @@ impl MonoTimer {
         drop(dwt);
 
         MonoTimer {
-            frequency: clocks.sysclk(),
+            frequency: clocks.hclk(),
         }
     }