diff --git a/neo/renderer/Image_files.cpp b/neo/renderer/Image_files.cpp
index 978d2d09..24436c80 100644
--- a/neo/renderer/Image_files.cpp
+++ b/neo/renderer/Image_files.cpp
@@ -830,7 +830,7 @@ static void LoadJPG( const char *filename, unsigned char **pic, int *width, int
 
   /* Step 3: read file parameters with jpeg_read_header() */
 
-  (void) jpeg_read_header(&cinfo, true );
+  (void) jpeg_read_header(&cinfo, (boolean)true);
   /* We can ignore the return value from jpeg_read_header since
    *   (a) suspension is not possible with the stdio data source, and
    *   (b) we passed TRUE to reject a tables-only JPEG file as an error.