diff --git a/MagickWand/display.c b/MagickWand/display.c
index 8871d3d..427a8a4 100644
--- a/MagickWand/display.c
+++ b/MagickWand/display.c
@@ -448,10 +448,10 @@
image_info->quality=StringToUnsignedLong(resource_value);
resource_value=XGetResourceInstance(resource_database,GetClientName(),
"verbose","False");
- image_info->verbose=IsMagickTrue(resource_value);
+ image_info->verbose=IsStringTrue(resource_value);
resource_value=XGetResourceInstance(resource_database,GetClientName(),
"dither","True");
- quantize_info->dither=IsMagickTrue(resource_value);
+ quantize_info->dither=IsStringTrue(resource_value);
/*
Parse command line.
*/