diff --git a/Contrib/NSISdl/util.cpp b/Contrib/NSISdl/util.cpp
index 6d17e009..e81b6496 100644
--- a/Contrib/NSISdl/util.cpp
+++ b/Contrib/NSISdl/util.cpp
@@ -26,56 +26,26 @@ int my_atoi(char *s)
   return (int)v;
 }
 
-// Updated for int64 and simple bitwise operations
 __int64 myatoi64(char *s)
 {
   __int64 v=0;
-  // Check for right input
-  if (!s) return 0;
-  if (*s == '0' && (s[1] == 'x' || s[1] == 'X'))
-  {
-    s++;
-    for (;;)
-    {
-      int c=*(++s);
-      if (c >= '0' && c <= '9') c-='0';
-      else if (c >= 'a' && c <= 'f') c-='a'-10;
-      else if (c >= 'A' && c <= 'F') c-='A'-10;
-      else break;
-      v<<=4;
-      v+=c;
-    }
-  }
-  else if (*s == '0' && s[1] <= '7' && s[1] >= '0')
-  {
-    for (;;)
-    {
-      int c=*(++s);
-      if (c >= '0' && c <= '7') c-='0';
-      else break;
-      v<<=3;
-      v+=c;
-    }
-  }
+  int sign=0;
+
+  if (*s == '-')
+    sign++;
   else
+    s--;
+
+  for (;;)
   {
-    int sign=0;
-    if (*s == '-') sign++; else s--;
-    for (;;)
-    {
-      int c=*(++s) - '0';
-      if (c < 0 || c > 9) break;
-      v*=10;
-      v+=c;
-    }
-    if (sign) v = -v;
+    int c=*(++s) - '0';
+    if (c < 0 || c > 9) break;
+    v*=10;
+    v+=c;
   }
 
-  // Support for simple ORed expressions
-  if (*s == '|') 
-  {
-      v |= myatoi64(s+1);
-  }
+  if (sign)
+    v = -v;
 
   return v;
 }