diff --git a/libavcodec/x86/h264_qpel.c b/libavcodec/x86/h264_qpel.c
index f909825944..2d1c443254 100644
--- a/libavcodec/x86/h264_qpel.c
+++ b/libavcodec/x86/h264_qpel.c
@@ -28,17 +28,20 @@
 #include "dsputil_mmx.h"
 
 #if HAVE_YASM
-void ff_put_pixels4_mmxext(uint8_t *block, const uint8_t *pixels, int line_size, int h);
-void ff_avg_pixels4_mmxext(uint8_t *block, const uint8_t *pixels, int line_size, int h);
-void ff_put_pixels8_mmxext(uint8_t *block, const uint8_t *pixels, int line_size, int h);
+void ff_put_pixels4_mmxext(uint8_t *block, const uint8_t *pixels,
+                           ptrdiff_t line_size, int h);
+void ff_avg_pixels4_mmxext(uint8_t *block, const uint8_t *pixels,
+                           ptrdiff_t line_size, int h);
+void ff_put_pixels8_mmxext(uint8_t *block, const uint8_t *pixels,
+                           ptrdiff_t line_size, int h);
 static void ff_put_pixels16_mmxext(uint8_t *block, const uint8_t *pixels,
-                                   int line_size, int h)
+                                   ptrdiff_t line_size, int h)
 {
     ff_put_pixels8_mmxext(block,     pixels,     line_size, h);
     ff_put_pixels8_mmxext(block + 8, pixels + 8, line_size, h);
 }
 static void ff_avg_pixels16_mmxext(uint8_t *block, const uint8_t *pixels,
-                                   int line_size, int h)
+                                   ptrdiff_t line_size, int h)
 {
     ff_avg_pixels8_mmxext(block,     pixels,     line_size, h);
     ff_avg_pixels8_mmxext(block + 8, pixels + 8, line_size, h);
diff --git a/libavcodec/x86/qpel.asm b/libavcodec/x86/qpel.asm
index ba97e2aec8..583f0d2791 100644
--- a/libavcodec/x86/qpel.asm
+++ b/libavcodec/x86/qpel.asm
@@ -176,7 +176,7 @@ PIXELS16_L2 put
 PIXELS16_L2 avg
 
 INIT_MMX mmxext
-; void pixels(uint8_t *block, const uint8_t *pixels, int line_size, int h)
+; void pixels(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
 %macro PIXELS48 2
 %if %2 == 4
 %define OP movh