diff --git a/c-programming/io/freadln.c b/c-programming/io/freadln.c
index 7535dae..c172d29 100644
--- a/c-programming/io/freadln.c
+++ b/c-programming/io/freadln.c
@@ -116,7 +116,7 @@ int freadln(FILE* f, char** output, size_t* length_out) {
 #  endif
 # endif
 
-# if defined(NO_SIZE_T_FORMAT)
+# ifdef NO_SIZE_T_FORMAT
 #  define PRIuSIZE PRIuMAX
 typedef uintmax_t SIZE_T_FORMAT;
 # else