diff --git a/src/dfmt.d b/src/dfmt.d
index 70b6209..f66a504 100644
--- a/src/dfmt.d
+++ b/src/dfmt.d
@@ -283,11 +283,12 @@ private:
         }
         else if (current.type == tok!"switch")
             formatSwitch();
-        else if (current.type == tok!"version" && peekIs(tok!"("))
+        else if ((current.type == tok!"version" || current.type == tok!"extern")
+            && peekIs(tok!"("))
         {
             writeToken();
             write(" ");
-            writeParens(false);
+            writeParens(true);
         }
         else if (currentIsBlockHeader())
         {
diff --git a/tests/issue0026.d.ref b/tests/issue0026.d.ref
index 17c536b..902bfd9 100644
--- a/tests/issue0026.d.ref
+++ b/tests/issue0026.d.ref
@@ -1 +1 @@
-extern(C++) int HtmlNamedEntity(const(char)* p, size_t length);
+extern (C++) int HtmlNamedEntity(const(char)* p, size_t length);
diff --git a/tests/issue0039.d b/tests/issue0039.d
new file mode 100644
index 0000000..002e8d2
--- /dev/null
+++ b/tests/issue0039.d
@@ -0,0 +1,2 @@
+version(AArch64)
+int x = 10;
diff --git a/tests/issue0039.d.ref b/tests/issue0039.d.ref
new file mode 100644
index 0000000..206b331
--- /dev/null
+++ b/tests/issue0039.d.ref
@@ -0,0 +1 @@
+version (AArch64) int x = 10;