Index: src/newgrf_text.cpp
===================================================================
--- src/newgrf_text.cpp	(revision 14073)
+++ src/newgrf_text.cpp	(working copy)
@@ -239,8 +239,8 @@
 			case 0x80: d += Utf8Encode(d, SCC_NEWGRF_PRINT_DWORD + c - 0x7B); break;
 			case 0x81: {
 				StringID string;
-				string  = *str++;
-				string |= *str++ << 8;
+				string  = uint8(*str++);
+				string |= uint8(*str++) << 8;
 				d += Utf8Encode(d, SCC_STRING_ID);
 				d += Utf8Encode(d, MapGRFStringID(grfid, string));
 				break;
@@ -273,8 +273,8 @@
 					case 0: /* FALL THROUGH */
 					case 1: d += Utf8Encode(d, SCC_NEWGRF_PRINT_QWORD_CURRENCY); break;
 					case 3: {
-						uint16 tmp = *str++;
-						tmp |= (*str++) << 8;
+						uint16 tmp = uint8(*str++);
+						tmp |= uint8(*str++) << 8;
 						d += Utf8Encode(d, SCC_NEWGRF_PUSH_WORD); d += Utf8Encode(d, tmp);
 					} break;
 					case 4: d += Utf8Encode(d, SCC_NEWGRF_UNPRINT); d += Utf8Encode(d, *str++); break;