diff --git a/boards/arm/olimex_stm32_e407/olimex_stm32_e407.dts b/boards/arm/olimex_stm32_e407/olimex_stm32_e407.dts
index b2e1dd286d4..3d07b2acf3f 100644
--- a/boards/arm/olimex_stm32_e407/olimex_stm32_e407.dts
+++ b/boards/arm/olimex_stm32_e407/olimex_stm32_e407.dts
@@ -52,8 +52,8 @@
 };
 
 &pll {
-	div-m = <6>;
-	mul-n = <168>;
+	div-m = <12>;
+	mul-n = <336>;
 	div-p = <2>;
 	div-q = <7>;
 	clocks = <&clk_hse>;
diff --git a/boards/arm/olimex_stm32_h405/olimex_stm32_h405.dts b/boards/arm/olimex_stm32_h405/olimex_stm32_h405.dts
index 1a13a8e2e69..4c168a3d939 100644
--- a/boards/arm/olimex_stm32_h405/olimex_stm32_h405.dts
+++ b/boards/arm/olimex_stm32_h405/olimex_stm32_h405.dts
@@ -53,8 +53,8 @@
 };
 
 &pll {
-	div-m = <4>;
-	mul-n = <168>;
+	div-m = <8>;
+	mul-n = <336>;
 	div-p = <2>;
 	div-q = <7>;
 	clocks = <&clk_hse>;
diff --git a/boards/arm/olimex_stm32_h407/olimex_stm32_h407.dts b/boards/arm/olimex_stm32_h407/olimex_stm32_h407.dts
index f74bddb953d..a0d1dd1f80b 100644
--- a/boards/arm/olimex_stm32_h407/olimex_stm32_h407.dts
+++ b/boards/arm/olimex_stm32_h407/olimex_stm32_h407.dts
@@ -52,8 +52,8 @@
 };
 
 &pll {
-	div-m = <6>;
-	mul-n = <168>;
+	div-m = <12>;
+	mul-n = <336>;
 	div-p = <2>;
 	div-q = <7>;
 	clocks = <&clk_hse>;