diff --git a/libavcodec/qdmc.c b/libavcodec/qdmc.c
index 4b582dc3491..081c4dd46f0 100644
--- a/libavcodec/qdmc.c
+++ b/libavcodec/qdmc.c
@@ -25,6 +25,7 @@
 #define BITSTREAM_READER_LE
 
 #include "libavutil/channel_layout.h"
+#include "libavutil/mem_internal.h"
 #include "libavutil/thread.h"
 #include "libavutil/tx.h"
 
diff --git a/libavutil/mem.h b/libavutil/mem.h
index c9c4fcf1ff0..b093b3b5cb0 100644
--- a/libavutil/mem.h
+++ b/libavutil/mem.h
@@ -51,86 +51,6 @@
  * @{
  */
 
-#if FF_API_DECLARE_ALIGNED
-/**
- *
- * @defgroup lavu_mem_macros Alignment Macros
- * Helper macros for declaring aligned variables.
- * @{
- */
-
-/**
- * @def DECLARE_ALIGNED(n,t,v)
- * Declare a variable that is aligned in memory.
- *
- * @code{.c}
- * DECLARE_ALIGNED(16, uint16_t, aligned_int) = 42;
- * DECLARE_ALIGNED(32, uint8_t, aligned_array)[128];
- *
- * // The default-alignment equivalent would be
- * uint16_t aligned_int = 42;
- * uint8_t aligned_array[128];
- * @endcode
- *
- * @param n Minimum alignment in bytes
- * @param t Type of the variable (or array element)
- * @param v Name of the variable
- */
-
-/**
- * @def DECLARE_ASM_ALIGNED(n,t,v)
- * Declare an aligned variable appropriate for use in inline assembly code.
- *
- * @code{.c}
- * DECLARE_ASM_ALIGNED(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
- * @endcode
- *
- * @param n Minimum alignment in bytes
- * @param t Type of the variable (or array element)
- * @param v Name of the variable
- */
-
-/**
- * @def DECLARE_ASM_CONST(n,t,v)
- * Declare a static constant aligned variable appropriate for use in inline
- * assembly code.
- *
- * @code{.c}
- * DECLARE_ASM_CONST(16, uint64_t, pw_08) = UINT64_C(0x0008000800080008);
- * @endcode
- *
- * @param n Minimum alignment in bytes
- * @param t Type of the variable (or array element)
- * @param v Name of the variable
- */
-
-#if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1110 || defined(__SUNPRO_C)
-    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
-    #define DECLARE_ASM_ALIGNED(n,t,v)  t __attribute__ ((aligned (n))) v
-    #define DECLARE_ASM_CONST(n,t,v)    const t __attribute__ ((aligned (n))) v
-#elif defined(__DJGPP__)
-    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (FFMIN(n, 16)))) v
-    #define DECLARE_ASM_ALIGNED(n,t,v)  t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
-    #define DECLARE_ASM_CONST(n,t,v)    static const t av_used __attribute__ ((aligned (FFMIN(n, 16)))) v
-#elif defined(__GNUC__) || defined(__clang__)
-    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
-    #define DECLARE_ASM_ALIGNED(n,t,v)  t av_used __attribute__ ((aligned (n))) v
-    #define DECLARE_ASM_CONST(n,t,v)    static const t av_used __attribute__ ((aligned (n))) v
-#elif defined(_MSC_VER)
-    #define DECLARE_ALIGNED(n,t,v)      __declspec(align(n)) t v
-    #define DECLARE_ASM_ALIGNED(n,t,v)  __declspec(align(n)) t v
-    #define DECLARE_ASM_CONST(n,t,v)    __declspec(align(n)) static const t v
-#else
-    #define DECLARE_ALIGNED(n,t,v)      t v
-    #define DECLARE_ASM_ALIGNED(n,t,v)  t v
-    #define DECLARE_ASM_CONST(n,t,v)    static const t v
-#endif
-
-/**
- * @}
- */
-#endif
-
 /**
  * @defgroup lavu_mem_attrs Function Attributes
  * Function attributes applicable to memory handling functions.
diff --git a/libavutil/mem_internal.h b/libavutil/mem_internal.h
index 955e31a6981..2448c606f19 100644
--- a/libavutil/mem_internal.h
+++ b/libavutil/mem_internal.h
@@ -30,7 +30,6 @@
 #include "mem.h"
 #include "version.h"
 
-#if !FF_API_DECLARE_ALIGNED
 /**
  * @def DECLARE_ALIGNED(n,t,v)
  * Declare a variable that is aligned in memory.
@@ -97,7 +96,6 @@
     #define DECLARE_ASM_ALIGNED(n,t,v)  t v
     #define DECLARE_ASM_CONST(n,t,v)    static const t v
 #endif
-#endif
 
 // Some broken preprocessors need a second expansion
 // to be forced to tokenize __VA_ARGS__
diff --git a/libavutil/version.h b/libavutil/version.h
index 38769962cc3..6014743947c 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -105,7 +105,6 @@
  * @{
  */
 
-#define FF_API_DECLARE_ALIGNED          (LIBAVUTIL_VERSION_MAJOR < 58)
 #define FF_API_COLORSPACE_NAME          (LIBAVUTIL_VERSION_MAJOR < 58)
 #define FF_API_AV_MALLOCZ_ARRAY         (LIBAVUTIL_VERSION_MAJOR < 58)
 #define FF_API_FIFO_PEEK2               (LIBAVUTIL_VERSION_MAJOR < 58)
