diff --git a/test/add_noise_test.cc b/test/add_noise_test.cc
index 96e3afbee..d25e4f5f5 100644
--- a/test/add_noise_test.cc
+++ b/test/add_noise_test.cc
@@ -144,8 +144,7 @@ TEST_P(AddNoiseTest, CheckNoiseAdded) {
   vpx_free(s);
 }
 
-// TODO(jimbankoski): Make the c work like assembly so we can enable this.
-TEST_P(AddNoiseTest, DISABLED_CheckCvsAssembly) {
+TEST_P(AddNoiseTest, CheckCvsAssembly) {
   DECLARE_ALIGNED(16, char, blackclamp[16]);
   DECLARE_ALIGNED(16, char, whiteclamp[16]);
   DECLARE_ALIGNED(16, char, bothclamp[16]);
@@ -167,8 +166,10 @@ TEST_P(AddNoiseTest, DISABLED_CheckCvsAssembly) {
   memset(s, 99, image_size);
   memset(d, 99, image_size);
 
+  srand(0);
   ASM_REGISTER_STATE_CHECK(GetParam()(s, noise, blackclamp, whiteclamp,
                                       bothclamp, width, height, width));
+  srand(0);
   ASM_REGISTER_STATE_CHECK(vpx_plane_add_noise_c(d, noise, blackclamp,
                                                  whiteclamp, bothclamp,
                                                  width, height, width));
diff --git a/vpx_dsp/postproc.c b/vpx_dsp/postproc.c
index c337e6e9b..682b44419 100644
--- a/vpx_dsp/postproc.c
+++ b/vpx_dsp/postproc.c
@@ -23,21 +23,18 @@ void vpx_plane_add_noise_c(uint8_t *start, char *noise,
                            unsigned int width, unsigned int height, int pitch) {
   unsigned int i, j;
 
-  // TODO(jbb): why does simd code use both but c doesn't,  normalize and
-  // fix..
-  (void) bothclamp;
   for (i = 0; i < height; i++) {
     uint8_t *pos = start + i * pitch;
     char  *ref = (char *)(noise + (rand() & 0xff));  // NOLINT
 
     for (j = 0; j < width; j++) {
-      if (pos[j] < blackclamp[0])
-        pos[j] = blackclamp[0];
+      int v = pos[j];
 
-      if (pos[j] > 255 - whiteclamp[0])
-        pos[j] = 255 - whiteclamp[0];
+      v = clamp(v - blackclamp[0], 0, 255);
+      v = clamp(v + bothclamp[0], 0, 255);
+      v = clamp(v - whiteclamp[0], 0, 255);
 
-      pos[j] += ref[j];
+      pos[j] = v + ref[j];
     }
   }
 }