diff -rauN icewm-1.3.8/src/icesh.cc icewm-1.3.8-narrowing-casts-patch/src/icesh.cc
--- icewm-1.3.8/src/icesh.cc	2013-11-17 17:54:39.000000000 +0100
+++ icewm-1.3.8-narrowing-casts-patch/src/icesh.cc	2018-06-06 17:03:27.154963162 +0200
@@ -245,7 +245,7 @@
 };
 
 SymbolTable layers = {
-    layerIdentifiers, 0, WinLayerCount - 1, WinLayerInvalid
+    layerIdentifiers, 0, WinLayerCount - 1, (long int)WinLayerInvalid
 };
 
 SymbolTable states = {
@@ -257,7 +257,7 @@
 };
 
 SymbolTable trayOptions = {
-    trayOptionIdentifiers, 0, WinTrayOptionCount - 1, WinTrayInvalid
+    trayOptionIdentifiers, 0, WinTrayOptionCount - 1, (long int)WinTrayInvalid
 };
 
 /******************************************************************************/