diff --git a/src/Makefile b/src/Makefile
index 1e77905..3197710 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,4 +1,4 @@
-CCFLAGS = -std=c99 -O3
+CCFLAGS = -std=c99 -O3 -Wno-error=deprecated-declarations
 LDFLAGS = -lcrypto -I../include
 
 TARGET = pixiewps
@@ -6,7 +6,7 @@ PREFIX = $(DESTDIR)/usr
 BINDIR = $(PREFIX)/bin
 
 all:
-	$(CC) $(CCFLAGS) -o $(TARGET) $(TARGET).c random_r.c $(LDFLAGS)
+	$(CC) $(CCFLAGS) -o $(TARGET) $(TARGET).c $(LDFLAGS)
 
 install:
 	install -D $(TARGET) $(BINDIR)/$(TARGET)
diff --git a/src/pixiewps.c b/src/pixiewps.c
index 6eddd71..24073ca 100644
--- a/src/pixiewps.c
+++ b/src/pixiewps.c
@@ -47,9 +47,9 @@
 
 #include <sys/time.h>
 #ifdef __MACH__
-#include <libkern/OSByteOrder.h>
+# include <libkern/OSByteOrder.h>
 #else
-#include <asm/byteorder.h>
+# include <asm/byteorder.h>
 #endif /* __MACH__ */
 
 #include "pixiewps.h"
@@ -423,11 +423,11 @@ int main(int argc, char **argv) {
 						srandom_r(print_seed + 1, buf);
 						for (int i = 0; i < 4; i++) {
 							random_r(buf, &res);
-#ifdef __MACH__
-                            uint32_t be = OSSwapBigToHostInt32(res);
-#else
-							uint32_t be = __be32_to_cpu(res);
-#endif
+							#ifdef __MACH__
+								uint32_t be = OSSwapBigToHostInt32(res);
+							#else
+								uint32_t be = __be32_to_cpu(res);
+							#endif
 							memcpy(&(wps->e_s1[4 * i]), &be, 4);
 							memcpy(wps->e_s2, wps->e_s1, WPS_SECRET_NONCE_LEN); /* E-S1 = E-S2 != E-Nonce */
 						}
diff --git a/src/pixiewps.h b/src/pixiewps.h
index b7b4f5c..78be226 100644
--- a/src/pixiewps.h
+++ b/src/pixiewps.h
@@ -37,8 +37,8 @@
  * files in the program, then also delete it here.
  */
 
-#ifndef _PIXIEWPS_H
-#define _PIXIEWPS_H
+#ifndef PIXIEWPS_H
+#define PIXIEWPS_H
 
 #define VERSION           "1.1"
 #define MAX_MODE              4
@@ -155,18 +155,18 @@ void kdf(unsigned char *key, size_t key_len, unsigned char *res) {
 	unsigned char *buffer = malloc(WPS_KDF_SALT_LEN + 4 * 2);
 
 	for (i = 1; i < 4; i++) {
-#ifdef __MACH__
-        uint32_t be = OSSwapBigToHostInt32(i);
-#else
-        uint32_t be = __be32_to_cpu(i);
-#endif
+		#ifdef __MACH__
+			uint32_t be = OSSwapBigToHostInt32(i);
+		#else
+			uint32_t be = __be32_to_cpu(i);
+		#endif
 		memcpy(buffer, &be, 4);
 		memcpy(buffer + 4, salt, WPS_KDF_SALT_LEN);
-#ifdef __MACH__
-        be = OSSwapBigToHostInt32(kdk_len);
-#else
-        be = __be32_to_cpu(kdk_len);
-#endif
+		#ifdef __MACH__
+			be = OSSwapBigToHostInt32(kdk_len);
+		#else
+			be = __be32_to_cpu(kdk_len);
+		#endif
 		memcpy(buffer + 4 + 36, &be, 4);
 		hmac_sha256(key, WPS_HASH_LEN, buffer, WPS_KDF_SALT_LEN + 4 * 2, res + j);
 		j += WPS_HASH_LEN;
@@ -191,4 +191,4 @@ unsigned int wps_pin_valid(unsigned int pin) {
 	return wps_pin_checksum(pin / 10) == (pin % 10);
 }
 
-#endif /* _PIXIEWPS_H */
+#endif /* PIXIEWPS_H */
diff --git a/src/random_r.h b/src/random_r.h
index 3c3dc0a..0431ddd 100644
--- a/src/random_r.h
+++ b/src/random_r.h
@@ -37,8 +37,8 @@
  * files in the program, then also delete it here.
  */
 
-#ifndef _RANDOM_R_H
-#define _RANDOM_R_H
+#ifndef RANDOM_R_H
+#define RANDOM_R_H
 
 #include <stdint.h>
 
@@ -57,4 +57,4 @@ int srandom_r(unsigned int seed, struct random_data *buf);
 int initstate_r(unsigned int seed, char *arg_state, size_t n, struct random_data *buf);
 int setstate_r(char *arg_state, struct random_data *buf);
 
-#endif /* _RANDOM_R_H */
+#endif /* RANDOM_R_H */
diff --git a/src/utils.h b/src/utils.h
index f2f7686..9dd6f92 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -37,8 +37,8 @@
  * files in the program, then also delete it here.
  */
 
-#ifndef _UTILS_H
-#define _UTILS_H
+#ifndef UTILS_H
+#define UTILS_H
 
 /* Converts an hex string to a byte array */
 int hex_string_to_byte_array(char *in, unsigned char *out, int n_len) {
@@ -106,4 +106,4 @@ void byte_array_print(unsigned char *buffer, unsigned int length) {
 	}
 }
 
-#endif /* _UTILS_H */
+#endif /* UTILS_H */