diff --git a/scripts/pnglibconf.dfa b/scripts/pnglibconf.dfa
index 4d4ea8a3b..6325507e1 100755
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -305,10 +305,6 @@ option FLOATING_ARITHMETIC
 option FLOATING_POINT
 option FIXED_POINT
 
-# The following is always on (defined empty)
-
-setting CALLOC_SUPPORTED default
-
 # This protects us against compilers that run on a windowing system
 # and thus don't have or would rather us not use the stdio types:
 # stdin, stdout, and stderr.  The only one currently used is stderr
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index a1d7adf01..d2b881f30 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -187,7 +187,6 @@
 /* end of options */
 /* settings */
 #define PNG_API_RULE 0
-#define PNG_CALLOC_SUPPORTED
 #define PNG_COST_SHIFT 3
 #define PNG_DEFAULT_READ_MACROS 1
 #define PNG_GAMMA_THRESHOLD_FIXED 5000