diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 2dd673e9d..d060da2ee 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -8025,7 +8025,7 @@ int Abc_CommandExact( Abc_Frame_t * pAbc, int argc, char ** argv )
     if ( argc == globalUtilOptind )
         goto usage;
 
-    memset( pTruth, 0, 64 );
+    memset( pTruth, 0, 64 * sizeof(word) );
     while ( globalUtilOptind < argc )
     {
         if ( nFunc == 16 )