diff --git a/c-programming/io/freadln.c b/c-programming/io/freadln.c
index a4460ce..ed58735 100644
--- a/c-programming/io/freadln.c
+++ b/c-programming/io/freadln.c
@@ -82,9 +82,9 @@ int freadln(FILE* f, char** output, size_t* length_out) {
 #  define SLEEP_FN Sleep
 #  define DO_SLEEP 1
 # elif defined(__CYGWIN__) || defined(__unix__) || defined(__APPLE__) && \
-	defined(__MACH__) || defined(__linux__) || defined(__FreeBSD__) || \
-	defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || \
-	defined(__DragonFly__) || defined(__MINGW32__) || defined(__MINGW64__)
+       defined(__MACH__) || defined(__linux__) || defined(__FreeBSD__) || \
+       defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || \
+       defined(__DragonFly__) || defined(__MINGW32__) || defined(__MINGW64__)
 #  include <unistd.h>
 #  define SLEEP_FN usleep
 #  define DO_SLEEP 1