diff --git a/coders/yuv.c b/coders/yuv.c
index 8507fae320..261efb7fc4 100644
--- a/coders/yuv.c
+++ b/coders/yuv.c
@@ -165,8 +165,8 @@ static Image *ReadYUVImage(const ImageInfo *image_info,ExceptionInfo *exception)
       vertical_factor=horizontal_factor;
       if ((flags & SigmaValue) != 0)
         vertical_factor=(ssize_t) geometry_info.sigma;
-      if ((horizontal_factor != 1) && (horizontal_factor != 2) ||
-          (vertical_factor != 1) && (vertical_factor != 2))
+      if (((horizontal_factor != 1) && (horizontal_factor != 2)) ||
+          ((vertical_factor != 1) && (vertical_factor != 2)))
         ThrowReaderException(CorruptImageError,"UnexpectedSamplingFactor");
     }
   if ((interlace == UndefinedInterlace) ||
@@ -670,8 +670,8 @@ static MagickBooleanType WriteYUVImage(const ImageInfo *image_info,Image *image,
       vertical_factor=horizontal_factor;
       if ((flags & SigmaValue) != 0)
         vertical_factor=(ssize_t) geometry_info.sigma;
-      if ((horizontal_factor != 1) && (horizontal_factor != 2) ||
-          (vertical_factor != 1) && (vertical_factor != 2))
+      if (((horizontal_factor != 1) && (horizontal_factor != 2)) ||
+          ((vertical_factor != 1) && (vertical_factor != 2)))
         ThrowWriterException(CorruptImageError,"UnexpectedSamplingFactor");
     }
   if ((interlace == UndefinedInterlace) ||