diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c
index ef97bdb297..69980eaa49 100644
--- a/libavcodec/jpeglsdec.c
+++ b/libavcodec/jpeglsdec.c
@@ -149,7 +149,7 @@ static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q)
 {
     int k, ret;
 
-    for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
+    for (k = 0; ((unsigned)state->N[Q] << k) < state->A[Q]; k++)
         ;
 
 #ifdef JLS_BROKEN