diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 0cecf8fc9..89c1b0751 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -35427,7 +35427,7 @@ int Abc_CommandAbc9Ps( Abc_Frame_t * pAbc, int argc, char ** argv )
         if ( pAbc->pGiaBest == NULL )
         {
             Abc_Print( -1, "Abc_CommandAbc9Ps(): There is no AIG.\n" );
-            return 1;
+            return 0;
         }
         Gia_ManPrintStats( pAbc->pGiaBest, pPars );
     }
@@ -35436,7 +35436,7 @@ int Abc_CommandAbc9Ps( Abc_Frame_t * pAbc, int argc, char ** argv )
         if ( pAbc->pGia == NULL )
         {
             Abc_Print( -1, "Abc_CommandAbc9Ps(): There is no AIG.\n" );
-            return 1;
+            return 0;
         }
         Gia_ManPrintStats( pAbc->pGia, pPars );
     }
diff --git a/src/base/io/io.c b/src/base/io/io.c
index d841bdb52..6d81d3a45 100644
--- a/src/base/io/io.c
+++ b/src/base/io/io.c
@@ -4207,7 +4207,7 @@ int IoCommandWriteTruths( Abc_Frame_t * pAbc, int argc, char **argv )
     if ( pAbc->pGia == NULL )
     {
         Abc_Print( -1, "IoCommandWriteTruths(): There is no AIG.\n" );
-        return 1;
+        return 0;
     } 
     if ( Gia_ManPiNum(pAbc->pGia) > 16 )
     {