diff --git a/secure/materialdb.c b/secure/materialdb.c
index 11d3554..94c57b6 100644
--- a/secure/materialdb.c
+++ b/secure/materialdb.c
@@ -147,10 +147,10 @@
     if (pointerp(dif=props[P_RECOC])
 && (!intp(idinf)||idinf<100) ) { // 100=exakte Erkennung
       int i, n, recval;
-      mixed *grps, tmp, x;
+      mixed tmp, x;
 
       recval=0;
-      grps=props[P_MG_FRACTIONS];
+      mapping grps=props[P_MG_FRACTIONS];
       if (!pointerp(idinf))
         idinf=({idinf});