diff --git a/dtc.c b/dtc.c
index d36ccdc..e3665b6 100644
--- a/dtc.c
+++ b/dtc.c
@@ -237,7 +237,7 @@ int main(int argc, char *argv[])
 	if (streq(outname, "-")) {
 		outf = stdout;
 	} else {
-		outf = fopen(outname, "w");
+		outf = fopen(outname, "wb");
 		if (! outf)
 			die("Couldn't open output file %s: %s\n",
 			    outname, strerror(errno));
diff --git a/fstree.c b/fstree.c
index 4d2791c..6d1beec 100644
--- a/fstree.c
+++ b/fstree.c
@@ -52,7 +52,7 @@ static struct node *read_fstree(const char *dirname)
 			struct property *prop;
 			FILE *pfile;
 
-			pfile = fopen(tmpname, "r");
+			pfile = fopen(tmpname, "rb");
 			if (! pfile) {
 				fprintf(stderr,
 					"WARNING: Cannot open %s: %s\n",
diff --git a/srcpos.c b/srcpos.c
index 4549773..f534c22 100644
--- a/srcpos.c
+++ b/srcpos.c
@@ -77,7 +77,7 @@ static char *try_open(const char *dirname, const char *fname, FILE **fp)
 	else
 		fullname = join_path(dirname, fname);
 
-	*fp = fopen(fullname, "r");
+	*fp = fopen(fullname, "rb");
 	if (!*fp) {
 		free(fullname);
 		fullname = NULL;