diff --git a/scripts/nfs-ls.nse b/scripts/nfs-ls.nse
index de441ee17..ae68aebed 100644
--- a/scripts/nfs-ls.nse
+++ b/scripts/nfs-ls.nse
@@ -114,7 +114,7 @@ hostrule = function(host)
   end
   if nfsport == nil then return false end
   if host.registry.nfs.nfsver == nil then
-    local low, high = string.match(nfsport.version.version, "(%d)-(%d)")
+    local low, high = string.match(nfsport.version.version, "(%d)%-(%d)")
     if high == nil then
       high = tonumber(nfsport.version.version)
       if high == 4 then
@@ -132,7 +132,7 @@ hostrule = function(host)
   end
   if mountport == nil then return false end
   if host.registry.nfs.mountver == nil then
-    local low, high = string.match(mountport.version.version, "(%d)-(%d)")
+    local low, high = string.match(mountport.version.version, "(%d)%-(%d)")
     if high == nil then
       host.registry.nfs.mountver = tonumber(mountport.version.version)
     else
diff --git a/scripts/nfs-showmount.nse b/scripts/nfs-showmount.nse
index a50f5c2ef..f5953dc4e 100644
--- a/scripts/nfs-showmount.nse
+++ b/scripts/nfs-showmount.nse
@@ -45,7 +45,7 @@ local function get_exports(host, port)
     host.registry.nfs = {}
   end
   if mountver == nil then
-    local low, high = string.match(port.version.version, "(%d)-(%d)")
+    local low, high = string.match(port.version.version, "(%d)%-(%d)")
     if high == nil then
       mountver = tonumber(port.version.version)
     else
diff --git a/scripts/nfs-statfs.nse b/scripts/nfs-statfs.nse
index 6c2edf629..1337d34ae 100644
--- a/scripts/nfs-statfs.nse
+++ b/scripts/nfs-statfs.nse
@@ -67,7 +67,7 @@ hostrule = function(host)
   end
   if nfsport == nil then return false end
   if host.registry.nfs.nfsver == nil then
-    local low, high = string.match(nfsport.version.version, "(%d)-(%d)")
+    local low, high = string.match(nfsport.version.version, "(%d)%-(%d)")
     if high == nil then
       high = tonumber(nfsport.version.version)
       if high == 4 then
@@ -85,7 +85,7 @@ hostrule = function(host)
   end
   if mountport == nil then return false end
   if host.registry.nfs.mountver == nil then
-    local low, high = string.match(mountport.version.version, "(%d)-(%d)")
+    local low, high = string.match(mountport.version.version, "(%d)%-(%d)")
     if high == nil then
       host.registry.nfs.mountver = tonumber(mountport.version.version)
     else