diff --git a/libavcodec/x86/h264_idct.asm b/libavcodec/x86/h264_idct.asm
index a132480022..5e8c0edfa6 100644
--- a/libavcodec/x86/h264_idct.asm
+++ b/libavcodec/x86/h264_idct.asm
@@ -968,6 +968,9 @@ cglobal h264_idct_add8_8_sse2, 5, 7, 8
 
 %macro IDCT_DC_DEQUANT 2
 cglobal h264_luma_dc_dequant_idct_%1, 3,4,%2
+    ; manually spill XMM registers for Win64 because
+    ; the code here is initialized with INIT_MMX
+    WIN64_SPILL_XMM %2
     movq        m3, [r1+24]
     movq        m2, [r1+16]
     movq        m1, [r1+ 8]
diff --git a/libavcodec/x86/h264_intrapred.asm b/libavcodec/x86/h264_intrapred.asm
index 61c69c6488..c6b4386627 100644
--- a/libavcodec/x86/h264_intrapred.asm
+++ b/libavcodec/x86/h264_intrapred.asm
@@ -1931,6 +1931,9 @@ cglobal pred8x8l_vertical_right_mmxext, 4,5
 
 %macro PRED8x8L_VERTICAL_RIGHT 1
 cglobal pred8x8l_vertical_right_%1, 4,5,7
+    ; manually spill XMM registers for Win64 because
+    ; the code here is initialized with INIT_MMX
+    WIN64_SPILL_XMM 7
     sub          r0, r3
     lea          r4, [r0+r3*2]
     movq        mm0, [r0+r3*1-8]