diff --git a/rtengine/iccstore.cc b/rtengine/iccstore.cc
index 66099199c..82f280e54 100644
--- a/rtengine/iccstore.cc
+++ b/rtengine/iccstore.cc
@@ -263,7 +263,7 @@ cmsHPROFILE ICCStore::makeStdGammaProfile (cmsHPROFILE iprof)
                 tags[i].sig == 0x6B545243) { // kTRC
             if (gamma_offset == 0) {
                 gamma_offset = offset;
-                uint32_t pcurve[] = { htonl(0x63757276), htonl(0), htonl(gamma_size == 12 ? 0 : 1) };
+                uint32_t pcurve[] = { htonl(0x63757276), htonl(0), htonl(gamma_size == 12 ? 0U : 1U) };
                 memcpy(&nd[offset], pcurve, 12);
 
                 if (gamma_size == 14) {