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-rw-r--r--analyzer/pamsharpness.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/analyzer/pamsharpness.c b/analyzer/pamsharpness.c
index 7e52a9ba..2cb5edb9 100644
--- a/analyzer/pamsharpness.c
+++ b/analyzer/pamsharpness.c
@@ -136,7 +136,7 @@ main(int argc, char **argv) {
 
     ifP = pm_openr(cmdline.inputFilespec);
 
-	tuplenarray = pnm_readpamn(ifP, &inpam, sizeof(inpam));
+	tuplenarray = pnm_readpamn(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
 
     if (inpam.height < 3 || inpam.width < 3)
         pm_error("sharpness is undefined for an image less than 3 pixels "