diff --git a/libavutil/mem.h b/libavutil/mem.h
index 09159f7ee8..4898b085af 100644
--- a/libavutil/mem.h
+++ b/libavutil/mem.h
@@ -27,18 +27,18 @@
 #define FFMPEG_MEM_H
 
 #ifdef __ICC
-  #define DECLARE_ALIGNED(n,t,v)       t v __attribute__ ((aligned (n)))
-  #define DECLARE_ASM_CONST(n,t,v)     const t __attribute__ ((aligned (n))) v
+    #define DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))
+    #define DECLARE_ASM_CONST(n,t,v)    const t __attribute__ ((aligned (n))) v
 #elif defined(__GNUC__)
-  #define DECLARE_ALIGNED(n,t,v)       t v __attribute__ ((aligned (n)))
-  #define DECLARE_ASM_CONST(n,t,v)     static const t v attribute_used __attribute__ ((aligned (n)))
+    #define DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))
+    #define DECLARE_ASM_CONST(n,t,v)    static const t v attribute_used __attribute__ ((aligned (n)))
 #elif defined(_MSVC)
-  #define DECLARE_ALIGNED(n,t,v)      __declspec(align(n)) t v
-  #define DECLARE_ASM_CONST(n,t,v)    __declspec(align(n)) static const t v
+    #define DECLARE_ALIGNED(n,t,v)      __declspec(align(n)) t v
+    #define DECLARE_ASM_CONST(n,t,v)    __declspec(align(n)) static const t v
 #else
-  #warning No align and asm directives, this might fail.
-  #define DECLARE_ALIGNED(n,t,v)      t v
-  #define DECLARE_ASM_CONST(n,t,v)    static const t v
+    #warning No align and asm directives, this might fail.
+    #define DECLARE_ALIGNED(n,t,v)      t v
+    #define DECLARE_ASM_CONST(n,t,v)    static const t v
 #endif
 
 /**