diff --git a/src/core/demangle.d b/src/core/demangle.d
index 22e7e402ac6..9d9628b3886 100644
--- a/src/core/demangle.d
+++ b/src/core/demangle.d
@@ -753,6 +753,9 @@ private struct Demangle
                 parseType();
                 put( ')' );
                 return dst[beg .. len];
+            case 'p': // extern(Pascal) function
+                pos--; // step back to 'N'
+                return parseTypeFunction( name );
             default:
                 error();
                 assert( 0 );
@@ -943,6 +946,11 @@ private struct Demangle
             popFront();
             put( "extern (Windows) " );
             break;
+        case 'N':
+            popFront();
+            if( front != 'p' )
+                error();
+            goto case;
         case 'V': // Pascal
             popFront();
             put( "extern (Pascal) " );
@@ -1873,8 +1881,9 @@ private template isExternCPP(FT) if (is(FT == function))
 private template hasPlainMangling(FT) if (is(FT == function))
 {
     enum c = FT.mangleof[0];
-    // C || Pascal || Windows
-    enum hasPlainMangling = c == 'U' || c == 'V' || c == 'W';
+    enum hasPlainMangling = c == 'U' // C
+                         || c == 'V' || (c == 'N' && FT.mangleof[1] == 'p') // Pascal (temporarily support old and new mangling)
+                         || c == 'W'; // Windows
 }
 
 unittest