diff --git a/lib/system/freertos/sleep.h b/lib/system/freertos/sleep.h
index 60a58a17..2ad9994a 100644
--- a/lib/system/freertos/sleep.h
+++ b/lib/system/freertos/sleep.h
@@ -31,8 +31,6 @@ static inline int __metal_sleep_usec(unsigned int usec)
 	return 0;
 }
 
-/** @} */
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/system/generic/sleep.h b/lib/system/generic/sleep.h
index aa86df49..63d53088 100644
--- a/lib/system/generic/sleep.h
+++ b/lib/system/generic/sleep.h
@@ -29,8 +29,6 @@ static inline int __metal_sleep_usec(unsigned int usec)
 	return 0;
 }
 
-/** @} */
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/system/linux/sleep.h b/lib/system/linux/sleep.h
index d5cbe334..414576b3 100644
--- a/lib/system/linux/sleep.h
+++ b/lib/system/linux/sleep.h
@@ -27,8 +27,6 @@ static inline int __metal_sleep_usec(unsigned int usec)
 	return usleep(usec);
 }
 
-/** @} */
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/system/nuttx/sleep.h b/lib/system/nuttx/sleep.h
index b15f3b6f..c875ab66 100644
--- a/lib/system/nuttx/sleep.h
+++ b/lib/system/nuttx/sleep.h
@@ -27,8 +27,6 @@ static inline int __metal_sleep_usec(unsigned int usec)
 	return nxsig_usleep(usec);
 }
 
-/** @} */
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/system/zephyr/sleep.h b/lib/system/zephyr/sleep.h
index 4333990c..ac269dc0 100644
--- a/lib/system/zephyr/sleep.h
+++ b/lib/system/zephyr/sleep.h
@@ -28,8 +28,6 @@ static inline int __metal_sleep_usec(unsigned int usec)
 	return 0;
 }
 
-/** @} */
-
 #ifdef __cplusplus
 }
 #endif