diff --git a/source/sw/src/grpscan.cpp b/source/sw/src/grpscan.cpp
index ddba9158c..0863cb60f 100644
--- a/source/sw/src/grpscan.cpp
+++ b/source/sw/src/grpscan.cpp
@@ -32,9 +32,9 @@
 
 grpfile grpfiles[numgrpfiles] =
 {
-    { "Registered Version",     0x7545319F, 47536148, NULL },
-    { "Shareware Version",      0x08A7FA1F, 26056769, NULL },
-    { "Wanton Destruction (Addon)", 0xA9AAA7B7, 48698128, NULL },
+    { "Registered Version",     0x7545319Fu, 47536148, NULL },
+    { "Shareware Version",      0x08A7FA1Fu, 26056769, NULL },
+    { "Wanton Destruction (Addon)", 0xA9AAA7B7u, 48698128, NULL },
 };
 grpfile *foundgrps = NULL;
 
diff --git a/source/sw/src/grpscan.h b/source/sw/src/grpscan.h
index b50ae9934..7e9e31ec0 100644
--- a/source/sw/src/grpscan.h
+++ b/source/sw/src/grpscan.h
@@ -29,7 +29,7 @@
 struct grpfile
 {
     const char *name;
-    int crcval;
+    unsigned int crcval;
     int size;
     struct grpfile *next;
 };