diff --git a/firmware/target/arm/stm32/echoplayer/clock-echoplayer.h b/firmware/target/arm/stm32/echoplayer/clock-echoplayer.h
index fe296ef6bb..8af8f57e44 100644
--- a/firmware/target/arm/stm32/echoplayer/clock-echoplayer.h
+++ b/firmware/target/arm/stm32/echoplayer/clock-echoplayer.h
@@ -24,9 +24,9 @@
 
 void echoplayer_clock_init(void) INIT_ATTR;
 
-extern struct stm32_clock sdmmc1_ker_clock;
-extern struct stm32_clock ltdc_ker_clock;
-extern struct stm32_clock spi5_ker_clock;
-extern struct stm32_clock i2c1_ker_clock;
+extern const struct stm32_clock sdmmc1_ker_clock;
+extern const struct stm32_clock ltdc_ker_clock;
+extern const struct stm32_clock spi5_ker_clock;
+extern const struct stm32_clock i2c1_ker_clock;
 
 #endif /* __CLOCK_ECHOPLAYER_H__ */