diff --git a/rtengine/iptransform.cc b/rtengine/iptransform.cc
index f227af2ed..43a110a5f 100644
--- a/rtengine/iptransform.cc
+++ b/rtengine/iptransform.cc
@@ -788,6 +788,10 @@ void ImProcFunctions::transformGeneral(ImProcFunctions::TransformMode mode, Imag
     bool enableLCPDist = false;
     bool enableCA = false;
 
+#ifdef __GNUC__ // silence warning
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#endif
     switch (mode) {
         case ImProcFunctions::TRANSFORM_HIGH_QUALITY_FULLIMAGE: {
             enableLCPCA = pLCPMap && params->lensProf.useCA && pLCPMap->isCACorrectionAvailable();
@@ -809,6 +813,9 @@ void ImProcFunctions::transformGeneral(ImProcFunctions::TransformMode mode, Imag
             break;
         }
     }
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
 
     if (!enableCA) {
         chDist[0] = 0.0;