diff --git a/libavcodec/x86/blockdsp.asm b/libavcodec/x86/blockdsp.asm
index 9d203df8f5..e380308d4a 100644
--- a/libavcodec/x86/blockdsp.asm
+++ b/libavcodec/x86/blockdsp.asm
@@ -46,9 +46,6 @@ cglobal clear_block, 1, 1, %1, blocks
     RET
 %endmacro
 
-INIT_MMX mmx
-%define ZERO pxor
-CLEAR_BLOCK 0, 4
 INIT_XMM sse
 %define ZERO xorps
 CLEAR_BLOCK 1, 2
@@ -78,9 +75,6 @@ cglobal clear_blocks, 1, 2, %1, blocks, len
     RET
 %endmacro
 
-INIT_MMX mmx
-%define ZERO pxor
-CLEAR_BLOCKS 0
 INIT_XMM sse
 %define ZERO xorps
 CLEAR_BLOCKS 1
diff --git a/libavcodec/x86/blockdsp_init.c b/libavcodec/x86/blockdsp_init.c
index d7f8a8e508..b0ff9376d9 100644
--- a/libavcodec/x86/blockdsp_init.c
+++ b/libavcodec/x86/blockdsp_init.c
@@ -24,10 +24,8 @@
 #include "libavutil/x86/cpu.h"
 #include "libavcodec/blockdsp.h"
 
-void ff_clear_block_mmx(int16_t *block);
 void ff_clear_block_sse(int16_t *block);
 void ff_clear_block_avx(int16_t *block);
-void ff_clear_blocks_mmx(int16_t *blocks);
 void ff_clear_blocks_sse(int16_t *blocks);
 void ff_clear_blocks_avx(int16_t *blocks);
 
@@ -37,11 +35,6 @@ av_cold void ff_blockdsp_init_x86(BlockDSPContext *c,
 #if HAVE_X86ASM
     int cpu_flags = av_get_cpu_flags();
 
-    if (EXTERNAL_MMX(cpu_flags)) {
-        c->clear_block  = ff_clear_block_mmx;
-        c->clear_blocks = ff_clear_blocks_mmx;
-    }
-
     if (EXTERNAL_SSE(cpu_flags)) {
         c->clear_block  = ff_clear_block_sse;
         c->clear_blocks = ff_clear_blocks_sse;