--- clipper/core/spacegroup_data.h_orig	2016-03-12 20:27:29.071469525 -0500
+++ clipper/core/spacegroup_data.h	2016-03-12 20:28:01.259590510 -0500
@@ -56,9 +56,9 @@
     // ASU function pointer
     typedef bool (*ASUfn)( const int&, const int&, const int& );
     // Spacegroup data record
-    struct SGdata { int sghash; const char* hall; const char* hm; char ext; int num; };
+    struct SGdata { unsigned int sghash; const char* hall; const char* hm; char ext; int num; };
     // Laue group data record
-    struct LGdata { int lghash; ASUfn asufn; const char* lgname; };
+    struct LGdata { unsigned int lghash; ASUfn asufn; const char* lgname; };
 
     // data tables
     extern LGdata lgdata[];