diff --git a/os/hal/platforms/STM32/hal_lld_f100.h b/os/hal/platforms/STM32/hal_lld_f100.h
index ce1b86868..1c2a9a864 100644
--- a/os/hal/platforms/STM32/hal_lld_f100.h
+++ b/os/hal/platforms/STM32/hal_lld_f100.h
@@ -349,7 +349,7 @@
 #endif
 
 /* APB1 frequency check.*/
-#if STM32_PCLK2 > 24000000
+#if STM32_PCLK1 > 24000000
 #error "STM32_PCLK1 exceeding maximum frequency (24MHz)"
 #endif
 
diff --git a/readme.txt b/readme.txt
index 99dae5433..b03cc907e 100644
--- a/readme.txt
+++ b/readme.txt
@@ -69,6 +69,7 @@
 *****************************************************************************
 
 *** 2.2.7 ***
+- FIX: Fixed wrong APB1 frequency check (bug 3361039).
 - FIX: Fixed missing state in shell demos (bug 3351556).
 
 *** 2.2.6 ***