diff --git a/libavcodec/x86/fpelbase.asm b/libavcodec/x86/fpelbase.asm
index a327206d6c..dc363d1a63 100644
--- a/libavcodec/x86/fpelbase.asm
+++ b/libavcodec/x86/fpelbase.asm
@@ -26,7 +26,7 @@
 SECTION .text
 
 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
diff --git a/libavcodec/x86/h264_qpel.c b/libavcodec/x86/h264_qpel.c
index 1e1ee4ecaa..4c37ee5472 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);