diff --git a/src/ntlm.h b/src/ntlm.h
index e310cc2..8acb814 100644
--- a/src/ntlm.h
+++ b/src/ntlm.h
@@ -8,38 +8,38 @@
 #include "ntlm_common.h"
 
 /* Negotiate Flags */
-#define NTLMSSP_NEGOTIATE_56                        (1 << 31)
-#define NTLMSSP_NEGOTIATE_KEY_EXCH                  (1 << 30)
-#define NTLMSSP_NEGOTIATE_128                       (1 << 29)
-#define UNUSED_R1                                   (1 << 28)
-#define UNUSED_R2                                   (1 << 27)
-#define UNUSED_R3                                   (1 << 26)
-#define NTLMSSP_NEGOTIATE_VERSION                   (1 << 25)
-#define UNUSED_R4                                   (1 << 24)
-#define NTLMSSP_NEGOTIATE_TARGET_INFO               (1 << 23)
-#define NTLMSSP_REQUEST_NON_NT_SESSION_KEY          (1 << 22)
-#define UNUSED_R5 /* Davenport: NEGOTIATE_ACCEPT */ (1 << 21)
-#define NTLMSSP_NEGOTIATE_IDENTIFY                  (1 << 20)
-#define NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY  (1 << 19)
-#define UNUSED_R6 /* Davenport:TARGET_TYPE_SHARE */ (1 << 18)
-#define NTLMSSP_TARGET_TYPE_SERVER                  (1 << 17)
-#define NTLMSSP_TARGET_TYPE_DOMAIN                  (1 << 16)
-#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN               (1 << 15)
-#define UNUSED_R7 /* Davenport:LOCAL_CALL */        (1 << 14)
-#define NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED  (1 << 13)
-#define NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED       (1 << 12)
-#define NTLMSSP_ANONYMOUS                           (1 << 11)
-#define UNUSED_R8                                   (1 << 10)
-#define NTLMSSP_NEGOTIATE_NTLM                      (1 << 9)
-#define UNUSED_R9                                   (1 << 8)
-#define NTLMSSP_NEGOTIATE_LM_KEY                    (1 << 7)
-#define NTLMSSP_NEGOTIATE_DATAGRAM                  (1 << 6)
-#define NTLMSSP_NEGOTIATE_SEAL                      (1 << 5)
-#define NTLMSSP_NEGOTIATE_SIGN                      (1 << 4)
-#define UNUSED_R10                                  (1 << 3)
-#define NTLMSSP_REQUEST_TARGET                      (1 << 2)
-#define NTLMSSP_NEGOTIATE_OEM                       (1 << 1)
-#define NTLMSSP_NEGOTIATE_UNICODE                   (1 << 0)
+#define NTLMSSP_NEGOTIATE_56                        (1U << 31)
+#define NTLMSSP_NEGOTIATE_KEY_EXCH                  (1U << 30)
+#define NTLMSSP_NEGOTIATE_128                       (1U << 29)
+#define UNUSED_R1                                   (1U << 28)
+#define UNUSED_R2                                   (1U << 27)
+#define UNUSED_R3                                   (1U << 26)
+#define NTLMSSP_NEGOTIATE_VERSION                   (1U << 25)
+#define UNUSED_R4                                   (1U << 24)
+#define NTLMSSP_NEGOTIATE_TARGET_INFO               (1U << 23)
+#define NTLMSSP_REQUEST_NON_NT_SESSION_KEY          (1U << 22)
+#define UNUSED_R5 /* Davenport: NEGOTIATE_ACCEPT */ (1U << 21)
+#define NTLMSSP_NEGOTIATE_IDENTIFY                  (1U << 20)
+#define NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY  (1U << 19)
+#define UNUSED_R6 /* Davenport:TARGET_TYPE_SHARE */ (1U << 18)
+#define NTLMSSP_TARGET_TYPE_SERVER                  (1U << 17)
+#define NTLMSSP_TARGET_TYPE_DOMAIN                  (1U << 16)
+#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN               (1U << 15)
+#define UNUSED_R7 /* Davenport:LOCAL_CALL */        (1U << 14)
+#define NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED  (1U << 13)
+#define NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED       (1U << 12)
+#define NTLMSSP_ANONYMOUS                           (1U << 11)
+#define UNUSED_R8                                   (1U << 10)
+#define NTLMSSP_NEGOTIATE_NTLM                      (1U << 9)
+#define UNUSED_R9                                   (1U << 8)
+#define NTLMSSP_NEGOTIATE_LM_KEY                    (1U << 7)
+#define NTLMSSP_NEGOTIATE_DATAGRAM                  (1U << 6)
+#define NTLMSSP_NEGOTIATE_SEAL                      (1U << 5)
+#define NTLMSSP_NEGOTIATE_SIGN                      (1U << 4)
+#define UNUSED_R10                                  (1U << 3)
+#define NTLMSSP_REQUEST_TARGET                      (1U << 2)
+#define NTLMSSP_NEGOTIATE_OEM                       (1U << 1)
+#define NTLMSSP_NEGOTIATE_UNICODE                   (1U << 0)
 
 /* (2.2.2.10 VERSION) */
 #define WINDOWS_MAJOR_VERSION_5 0x05