diff --git a/libavutil/attributes.h b/libavutil/attributes.h
index 5c6b9deecb..54d1901116 100644
--- a/libavutil/attributes.h
+++ b/libavutil/attributes.h
@@ -121,8 +121,7 @@
 #endif
 #endif
 
-
-#if defined(__GNUC__)
+#if defined(__GNUC__) || defined(__clang__)
 #    define av_unused __attribute__((unused))
 #else
 #    define av_unused
@@ -133,7 +132,7 @@
  * away.  This is useful for variables accessed only from inline
  * assembler without the compiler being aware.
  */
-#if AV_GCC_VERSION_AT_LEAST(3,1)
+#if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__)
 #    define av_used __attribute__((used))
 #else
 #    define av_used
diff --git a/libavutil/mem.h b/libavutil/mem.h
index f9d8884788..718a143c4c 100644
--- a/libavutil/mem.h
+++ b/libavutil/mem.h
@@ -97,7 +97,7 @@
     #define DECLARE_ASM_CONST(n,t,v)                    \
         AV_PRAGMA(DATA_ALIGN(v,n))                      \
         static const t __attribute__((aligned(n))) v
-#elif defined(__GNUC__)
+#elif defined(__GNUC__) || defined(__clang__)
     #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
     #define DECLARE_ASM_CONST(n,t,v)    static const t av_used __attribute__ ((aligned (n))) v
 #elif defined(_MSC_VER)