diff --git a/src/type1/t1gload.c b/src/type1/t1gload.c
index cc8288d85..481e5afe1 100644
--- a/src/type1/t1gload.c
+++ b/src/type1/t1gload.c
@@ -289,7 +289,7 @@
 
 #ifdef FT_CONFIG_OPTION_INCREMENTAL
     if ( glyph_index >= (FT_UInt)face->root.num_glyphs &&
-         face->root.internal->incremental_interface    )
+         !face->root.internal->incremental_interface   )
 #else
     if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
 #endif /* FT_CONFIG_OPTION_INCREMENTAL */