diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10bc485..2b79ef9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 # Changed
 * Only ever create one iref box, filled with multiple cdsc boxes (#247)
+* Fix incorrect 16-to-8 monochrome YUV conversion
 
 ## [0.8.0] - 2020-07-14
 
diff --git a/src/reformat.c b/src/reformat.c
index e4696b4..b8a25e9 100644
--- a/src/reformat.c
+++ b/src/reformat.c
@@ -706,9 +706,9 @@
             const float Gc = AVIF_CLAMP(G, 0.0f, 1.0f);
             const float Bc = AVIF_CLAMP(B, 0.0f, 1.0f);
 
-            *((uint16_t *)ptrR) = (uint16_t)(0.5f + (Rc * rgbMaxChannel));
-            *((uint16_t *)ptrG) = (uint16_t)(0.5f + (Gc * rgbMaxChannel));
-            *((uint16_t *)ptrB) = (uint16_t)(0.5f + (Bc * rgbMaxChannel));
+            *ptrR = (uint8_t)(0.5f + (Rc * rgbMaxChannel));
+            *ptrG = (uint8_t)(0.5f + (Gc * rgbMaxChannel));
+            *ptrB = (uint8_t)(0.5f + (Bc * rgbMaxChannel));
 
             ptrR += rgbPixelBytes;
             ptrG += rgbPixelBytes;