diff --git a/hardware/asix-sigma/asix-sigma.c b/hardware/asix-sigma/asix-sigma.c
index 427d7905..c89ed31f 100644
--- a/hardware/asix-sigma/asix-sigma.c
+++ b/hardware/asix-sigma/asix-sigma.c
@@ -312,9 +312,9 @@ static int bin2bitbang(const char *filename,
 	int c, ret, bit, v;
 	uint32_t imm = 0x3f6df2ab;
 
-	f = fopen(filename, "r");
+	f = fopen(filename, "rb");
 	if (!f) {
-		g_warning("fopen(\"%s\", \"r\")", filename);
+		g_warning("fopen(\"%s\", \"rb\")", filename);
 		return -1;
 	}
 
diff --git a/hardware/common/ezusb.c b/hardware/common/ezusb.c
index 884ceafd..587abe7f 100644
--- a/hardware/common/ezusb.c
+++ b/hardware/common/ezusb.c
@@ -50,7 +50,7 @@ int ezusb_install_firmware(libusb_device_handle *hdl, const char *filename)
 	unsigned char buf[4096];
 
 	g_message("Uploading firmware at %s", filename);
-	if ((fw = fopen(filename, "r")) == NULL) {
+	if ((fw = fopen(filename, "rb")) == NULL) {
 		g_warning("Unable to open firmware file %s for reading: %s",
 			  filename, strerror(errno));
 		return 1;