diff --git a/src/text/face.cpp b/src/text/face.cpp
index 10afa65ae..79f35d8fe 100644
--- a/src/text/face.cpp
+++ b/src/text/face.cpp
@@ -36,12 +36,12 @@ font_face::font_face(FT_Face face)
 
 bool font_face::set_character_sizes(double size)
 {
-    return !FT_Set_Char_Size(face_,0,(FT_F26Dot6)(size * (1<<6)),0,0);
+    return (FT_Set_Char_Size(face_,0,(FT_F26Dot6)(size * (1<<6)),0,0) == 0);
 }
 
 bool font_face::set_unscaled_character_sizes()
 {
-    return !FT_Set_Char_Size(face_,0,face_->units_per_EM,0,0);
+    return (FT_Set_Char_Size(face_,0,face_->units_per_EM,0,0) == 0);
 }
 
 bool font_face::glyph_dimensions(glyph_info & glyph) const