diff --git a/libsparse/output_file.c b/libsparse/output_file.c
index cd30800..ba92563 100644
--- a/libsparse/output_file.c
+++ b/libsparse/output_file.c
@@ -24,6 +24,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ -34,13 +35,6 @@
 #include "sparse_crc32.h"
 #include "sparse_format.h"
 
-#ifndef USE_MINGW
-#include <sys/mman.h>
-#define O_BINARY 0
-#else
-#define ftruncate64 ftruncate
-#endif
-
 #if defined(__APPLE__) && defined(__MACH__)
 #define lseek64 lseek
 #define ftruncate64 ftruncate
@@ -748,7 +742,7 @@ int write_file_chunk(struct output_file *out, unsigned int len,
 {
 	int ret;
 
-	int file_fd = open(file, O_RDONLY | O_BINARY);
+	int file_fd = open(file, O_RDONLY);
 	if (file_fd < 0) {
 		return -errno;
 	}
diff --git a/make_ext4fs.c b/make_ext4fs.c
index 3623426..7fffd47 100644
--- a/make_ext4fs.c
+++ b/make_ext4fs.c
@@ -35,12 +35,6 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
-#ifndef USE_MINGW
-
-#define O_BINARY 0
-
-#endif
-
 /* TODO: Not implemented:
    Allocating blocks in the same block group as the file inode
    Hash or binary tree directories
@@ -364,7 +358,7 @@ int make_ext4fs(const char *filename, long long len,
 	reset_ext4fs_info();
 	info.len = len;
 
-	fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
+	fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 	if (fd < 0) {
 		error_errno("open");
 		return EXIT_FAILURE;
diff --git a/make_ext4fs_main.c b/make_ext4fs_main.c
index 57d263b..58853d1 100644
--- a/make_ext4fs_main.c
+++ b/make_ext4fs_main.c
@@ -33,10 +33,6 @@
 #include "ext4_utils.h"
 #include "canned_fs_config.h"
 
-#ifndef USE_MINGW /* O_BINARY is windows-specific flag */
-#define O_BINARY 0
-#endif
-
 extern struct fs_info info;
 
 
@@ -181,7 +177,7 @@ int main(int argc, char **argv)
 	}
 
 	if (strcmp(filename, "-")) {
-		fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
+		fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 		if (fd < 0) {
 			perror("open");
 			return EXIT_FAILURE;