diff --git a/libavfilter/x86/vf_idet.asm b/libavfilter/x86/vf_idet.asm
index 9596abd7e2..7bc8e7d2c4 100644
--- a/libavfilter/x86/vf_idet.asm
+++ b/libavfilter/x86/vf_idet.asm
@@ -25,60 +25,6 @@
 
 SECTION .text
 
-; Implementation that does 8-bytes at a time using single-word operations.
-%macro IDET_FILTER_LINE 1
-INIT_MMX %1
-cglobal idet_filter_line, 4, 5, 0, a, b, c, width, index
-    xor       indexq, indexq
-%define   m_zero m2
-%define   m_sum  m5
-    pxor      m_sum, m_sum
-    pxor      m_zero, m_zero
-
-.loop:
-    movu      m0, [aq + indexq*1]
-    punpckhbw m1, m0, m_zero
-    punpcklbw m0, m_zero
-
-    movu      m3, [cq + indexq*1]
-    punpckhbw m4, m3, m_zero
-    punpcklbw m3, m_zero
-
-    paddsw    m1, m4
-    paddsw    m0, m3
-
-    movu      m3, [bq + indexq*1]
-    punpckhbw m4, m3, m_zero
-    punpcklbw m3, m_zero
-
-    paddw     m4, m4
-    paddw     m3, m3
-    psubsw    m1, m4
-    psubsw    m0, m3
-
-    ABS2      m1, m0, m4, m3
-
-    paddw     m0, m1
-    punpckhwd m1, m0, m_zero
-    punpcklwd m0, m_zero
-
-    paddd     m0, m1
-    paddd     m_sum, m0
-
-    add       indexq, 0x8
-    CMP       widthd, indexd
-    jg        .loop
-
-    HADDD     m_sum, m0
-    movd      eax, m_sum
-    RET
-%endmacro
-
-%if ARCH_X86_32
-IDET_FILTER_LINE mmxext
-IDET_FILTER_LINE mmx
-%endif
-
 ;******************************************************************************
 ; 16bit implementation that does 4/8-pixels at a time
 
@@ -128,10 +74,6 @@ cglobal idet_filter_line_16bit, 4, 5, 8, a, b, c, width, index
 
 INIT_XMM sse2
 IDET_FILTER_LINE_16BIT 8
-%if ARCH_X86_32
-INIT_MMX mmx
-IDET_FILTER_LINE_16BIT 4
-%endif
 
 ;******************************************************************************
 ; SSE2 8-bit implementation that does 16-bytes at a time:
diff --git a/libavfilter/x86/vf_idet_init.c b/libavfilter/x86/vf_idet_init.c
index d4d9bd0893..acb4e2a778 100644
--- a/libavfilter/x86/vf_idet_init.c
+++ b/libavfilter/x86/vf_idet_init.c
@@ -24,7 +24,7 @@
 
 #if HAVE_X86ASM
 
-/* declares main callable idet_filter_line_{mmx,mmxext,sse2}() */
+/* declares main callable idet_filter_line_sse2() */
 #define FUNC_MAIN_DECL(KIND, SPAN)                                        \
 int ff_idet_filter_line_##KIND(const uint8_t *a, const uint8_t *b,        \
                                const uint8_t *c, int w);                  \
@@ -58,11 +58,6 @@ static int idet_filter_line_16bit_##KIND(const uint16_t *a, const uint16_t *b, \
 
 FUNC_MAIN_DECL(sse2, 16)
 FUNC_MAIN_DECL_16bit(sse2, 8)
-#if ARCH_X86_32
-FUNC_MAIN_DECL(mmx, 8)
-FUNC_MAIN_DECL(mmxext, 8)
-FUNC_MAIN_DECL_16bit(mmx, 4)
-#endif
 
 #endif
 av_cold void ff_idet_init_x86(IDETContext *idet, int for_16b)
@@ -70,15 +65,6 @@ av_cold void ff_idet_init_x86(IDETContext *idet, int for_16b)
 #if HAVE_X86ASM
     const int cpu_flags = av_get_cpu_flags();
 
-#if ARCH_X86_32
-    if (EXTERNAL_MMX(cpu_flags)) {
-        idet->filter_line = for_16b ? (ff_idet_filter_func)idet_filter_line_16bit_mmx : idet_filter_line_mmx;
-    }
-    if (EXTERNAL_MMXEXT(cpu_flags)) {
-        idet->filter_line = for_16b ? (ff_idet_filter_func)idet_filter_line_16bit_mmx : idet_filter_line_mmxext;
-    }
-#endif // ARCH_x86_32
-
     if (EXTERNAL_SSE2(cpu_flags)) {
         idet->filter_line = for_16b ? (ff_idet_filter_func)idet_filter_line_16bit_sse2 : idet_filter_line_sse2;
     }