diff --git a/include/libopencm3/stm32/f3/rcc.h b/include/libopencm3/stm32/f3/rcc.h
index 2706b6ac..7c8ebf85 100644
--- a/include/libopencm3/stm32/f3/rcc.h
+++ b/include/libopencm3/stm32/f3/rcc.h
@@ -425,6 +425,7 @@ struct rcc_clock_scale {
 	uint8_t ppre1;
 	uint8_t ppre2;
 	uint8_t power_save;
+	uint32_t ahb_frequency;
 	uint32_t apb1_frequency;
 	uint32_t apb2_frequency;
 };
diff --git a/include/libopencm3/stm32/f4/rcc.h b/include/libopencm3/stm32/f4/rcc.h
index 24858cc7..79299eff 100644
--- a/include/libopencm3/stm32/f4/rcc.h
+++ b/include/libopencm3/stm32/f4/rcc.h
@@ -564,6 +564,7 @@ struct rcc_clock_scale {
 	uint8_t ppre1;
 	uint8_t ppre2;
 	uint8_t power_save;
+	uint32_t ahb_frequency;
 	uint32_t apb1_frequency;
 	uint32_t apb2_frequency;
 };
diff --git a/include/libopencm3/stm32/l1/rcc.h b/include/libopencm3/stm32/l1/rcc.h
index 6561e349..cf55c485 100644
--- a/include/libopencm3/stm32/l1/rcc.h
+++ b/include/libopencm3/stm32/l1/rcc.h
@@ -397,6 +397,7 @@ struct rcc_clock_scale {
 	uint8_t ppre1;
 	uint8_t ppre2;
 	enum pwr_vos_scale voltage_scale;
+	uint32_t ahb_frequency;
 	uint32_t apb1_frequency;
 	uint32_t apb2_frequency;
 	uint8_t msi_range;