diff --git a/modules/exploits/windows/local/bthpan.rb b/modules/exploits/windows/local/bthpan.rb
index b084b24773..8f86edb891 100644
--- a/modules/exploits/windows/local/bthpan.rb
+++ b/modules/exploits/windows/local/bthpan.rb
@@ -145,7 +145,7 @@ class MetasploitModule < Msf::Exploit::Local
       fail_with(Failure::None, 'Session is already elevated')
     end
 
-    unless check == Exploit::CheckCode::Vulnerable
+    if check == Exploit::CheckCode::Safe
       fail_with(Failure::NotVulnerable, "Exploit not available on this system")
     end
 
diff --git a/modules/exploits/windows/local/mqac_write.rb b/modules/exploits/windows/local/mqac_write.rb
index 8938107475..c466e1d768 100644
--- a/modules/exploits/windows/local/mqac_write.rb
+++ b/modules/exploits/windows/local/mqac_write.rb
@@ -115,7 +115,9 @@ class MetasploitModule < Msf::Exploit::Local
 
     # Running on Windows XP versions that aren't listed in the supported list
     # results in a BSOD and so we should not let that happen.
-    return unless check == Exploit::CheckCode::Appears
+    if check == Exploit::CheckCode::Safe
+      fail_with(Failure::NotVulnerable, "Exploit not available on this system")
+    end
 
     base_addr = 0xffff
     handle = open_device('\\\\.\\MQAC', 'FILE_SHARE_WRITE|FILE_SHARE_READ', 0, 'OPEN_EXISTING')
diff --git a/modules/exploits/windows/local/ms13_053_schlamperei.rb b/modules/exploits/windows/local/ms13_053_schlamperei.rb
index 3900bcd413..f6f7fef93c 100644
--- a/modules/exploits/windows/local/ms13_053_schlamperei.rb
+++ b/modules/exploits/windows/local/ms13_053_schlamperei.rb
@@ -64,7 +64,7 @@ class MetasploitModule < Msf::Exploit::Local
   def check
     os = sysinfo["OS"]
     unless (os =~ /windows/i)
-      return Exploit::CheckCode::Unknown
+      return Exploit::CheckCode::Safe
     end
 
     file_path = expand_path("%windir%") << "\\system32\\win32k.sys"
@@ -81,7 +81,7 @@ class MetasploitModule < Msf::Exploit::Local
         return Exploit::CheckCode::Appears if revision < 22348
       end
     end
-    return Exploit::CheckCode::Unknown
+    return Exploit::CheckCode::Safe
   end
 
 
@@ -96,7 +96,7 @@ class MetasploitModule < Msf::Exploit::Local
       fail_with(Failure::NoTarget, "Running against 64-bit systems is not supported")
     end
 
-    unless check == Exploit::CheckCode::Vulnerable
+    if check == Exploit::CheckCode::Safe
       fail_with(Failure::NotVulnerable, "Exploit not available on this system")
     end
 
diff --git a/modules/exploits/windows/local/ms14_070_tcpip_ioctl.rb b/modules/exploits/windows/local/ms14_070_tcpip_ioctl.rb
index e1eb99561c..6809b48556 100644
--- a/modules/exploits/windows/local/ms14_070_tcpip_ioctl.rb
+++ b/modules/exploits/windows/local/ms14_070_tcpip_ioctl.rb
@@ -99,7 +99,7 @@ class MetasploitModule < Msf::Exploit::Local
       fail_with(Failure::NoTarget, "Running against 64-bit systems is not supported")
     end
 
-    unless check == Exploit::CheckCode::Vulnerable
+    if check == Exploit::CheckCode::Safe
       fail_with(Failure::NotVulnerable, "Exploit not available on this system")
     end
 
diff --git a/modules/exploits/windows/local/virtual_box_guest_additions.rb b/modules/exploits/windows/local/virtual_box_guest_additions.rb
index 0f4af645c4..fd498565f7 100644
--- a/modules/exploits/windows/local/virtual_box_guest_additions.rb
+++ b/modules/exploits/windows/local/virtual_box_guest_additions.rb
@@ -138,7 +138,7 @@ class MetasploitModule < Msf::Exploit::Local
       fail_with(Failure::NoTarget, "Running against 64-bit systems is not supported")
     end
 
-    unless check == Exploit::CheckCode::Vulnerable
+    if check == Exploit::CheckCode::Safe
       fail_with(Failure::NotVulnerable, "Exploit not available on this system")
     end