diff --git a/lib/type1/objects.h b/lib/type1/objects.h
index 13cbae7..8ca37cc 100644
--- a/lib/type1/objects.h
+++ b/lib/type1/objects.h
@@ -214,7 +214,7 @@ struct xobject {
 /*SHARED*/
 /* NDW: personally, I want to see status and error messages! */
 #define IfTrace0(condition,model)                                 \
-        {if (condition) printf(model);}
+        {if (condition) printf("%s",model);}
 #define IfTrace1(condition,model,arg0)                            \
         {if (condition) printf(model,arg0);}
 #define IfTrace2(condition,model,arg0,arg1)                       \
diff --git a/lib/t1lib/t1subset.c b/lib/t1lib/t1subset.c
index da427b2..e76974f 100644
--- a/lib/t1lib/t1subset.c
+++ b/lib/t1lib/t1subset.c
@@ -759,7 +759,7 @@ char *T1_SubsetFont( int FontID,
 	     tr_len);
     T1_PrintLog( "T1_SubsetFont()", err_warn_msg_buf,
 		 T1LOG_DEBUG);
-    l+=sprintf( &(trailerbuf[l]), linebuf); /* contains the PostScript trailer */
+    l+=sprintf( &(trailerbuf[l]), "%s", linebuf); /* contains the PostScript trailer */
   }
   
   /* compute size of output file */