diff --git a/arch/arm/src/stm32wl5/stm32wl5_rcc.h b/arch/arm/src/stm32wl5/stm32wl5_rcc.h
index e4c73ee8bd010..4e3d621961738 100644
--- a/arch/arm/src/stm32wl5/stm32wl5_rcc.h
+++ b/arch/arm/src/stm32wl5/stm32wl5_rcc.h
@@ -43,7 +43,7 @@
 #define EXTERN extern "C"
 extern "C"
 {
-#elseO
+#else
 #define EXTERN extern
 #endif