diff --git a/src/intra.c b/src/intra.c
index b3e3e6a4..ab08ed93 100644
--- a/src/intra.c
+++ b/src/intra.c
@@ -24,6 +24,7 @@
 
 #include "intra.h"
 
+#include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -679,6 +680,9 @@ void intra_get_angular_pred(const encoder_control * const encoder, pixel* src, i
   pixel  ref_above[2 * LCU_WIDTH + 1];
   pixel  ref_left[2 * LCU_WIDTH + 1];
 
+  // Tell clang-analyzer that everything is ok.
+  assert(width == 4 || width == 8 || width == 16 || width == 32);
+
   abs_ang           = ang_table[abs_ang];
   intra_pred_angle  = sign_ang * abs_ang;