diff --git a/libavfilter/gradfun.h b/libavfilter/gradfun.h
index 6b192a3113..5d011309c6 100644
--- a/libavfilter/gradfun.h
+++ b/libavfilter/gradfun.h
@@ -37,12 +37,9 @@ typedef struct {
     void (*blur_line) (uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width);
 } GradFunContext;
 
+void ff_gradfun_init_x86(GradFunContext *gf);
+
 void ff_gradfun_filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers);
 void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width);
 
-void ff_gradfun_filter_line_mmx2(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers);
-void ff_gradfun_filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers);
-
-void ff_gradfun_blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width);
-
 #endif /* AVFILTER_GRADFUN_H */
diff --git a/libavfilter/vf_gradfun.c b/libavfilter/vf_gradfun.c
index 12977d92b7..71749fe7a9 100644
--- a/libavfilter/vf_gradfun.c
+++ b/libavfilter/vf_gradfun.c
@@ -123,7 +123,6 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     GradFunContext *gf = ctx->priv;
     float thresh = 1.2;
     int radius = 16;
-    int cpu_flags = av_get_cpu_flags();
 
     if (args)
         sscanf(args, "%f:%d", &thresh, &radius);
@@ -135,12 +134,8 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     gf->blur_line = ff_gradfun_blur_line_c;
     gf->filter_line = ff_gradfun_filter_line_c;
 
-    if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX2)
-        gf->filter_line = ff_gradfun_filter_line_mmx2;
-    if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3)
-        gf->filter_line = ff_gradfun_filter_line_ssse3;
-    if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2)
-        gf->blur_line = ff_gradfun_blur_line_sse2;
+    if (HAVE_MMX)
+        ff_gradfun_init_x86(gf);
 
     av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", thresh, gf->radius);
 
diff --git a/libavfilter/x86/gradfun.c b/libavfilter/x86/gradfun.c
index ff3b19d38d..1d6a7ab363 100644
--- a/libavfilter/x86/gradfun.c
+++ b/libavfilter/x86/gradfun.c
@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/attributes.h"
 #include "libavutil/cpu.h"
 #include "libavutil/x86_cpu.h"
 #include "libavfilter/gradfun.h"
@@ -25,9 +26,9 @@
 DECLARE_ALIGNED(16, static const uint16_t, pw_7f)[8] = {0x7F,0x7F,0x7F,0x7F,0x7F,0x7F,0x7F,0x7F};
 DECLARE_ALIGNED(16, static const uint16_t, pw_ff)[8] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
 
-void ff_gradfun_filter_line_mmx2(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
+#if HAVE_MMX2
+static void gradfun_filter_line_mmx2(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
 {
-#if HAVE_MMX
     intptr_t x;
     if (width & 3) {
         x = width & ~3;
@@ -70,12 +71,12 @@ void ff_gradfun_filter_line_mmx2(uint8_t *dst, uint8_t *src, uint16_t *dc, int w
          "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
         :"memory"
     );
-#endif
 }
+#endif
 
-void ff_gradfun_filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
-{
 #if HAVE_SSSE3
+static void gradfun_filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers)
+{
     intptr_t x;
     if (width & 7) {
         // could be 10% faster if I somehow eliminated this
@@ -117,12 +118,12 @@ void ff_gradfun_filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc, int
          "rm"(thresh), "m"(*dithers), "m"(*pw_7f)
         :"memory"
     );
-#endif // HAVE_SSSE3
 }
+#endif // HAVE_SSSE3
 
-void ff_gradfun_blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width)
-{
 #if HAVE_SSE
+static void gradfun_blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width)
+{
 #define BLURV(load)\
     intptr_t x = -2*width;\
     __asm__ volatile(\
@@ -160,5 +161,17 @@ void ff_gradfun_blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint
     } else {
         BLURV("movdqa");
     }
-#endif // HAVE_SSE
+}
+#endif // HAVE_SSE
+
+av_cold void ff_gradfun_init_x86(GradFunContext *gf)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2)
+        gf->filter_line = gradfun_filter_line_mmx2;
+    if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3)
+        gf->filter_line = gradfun_filter_line_ssse3;
+    if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2)
+        gf->blur_line = gradfun_blur_line_sse2;
 }