diff --git a/src/wren_compiler.c b/src/wren_compiler.c
index 044377bf..68372f5a 100644
--- a/src/wren_compiler.c
+++ b/src/wren_compiler.c
@@ -1900,11 +1900,16 @@ void statement(Compiler* compiler)
     // TODO: Variable should not be in scope until after initializer.
     int symbol = declareVariable(compiler);
 
-    // TODO: Allow uninitialized vars?
-    consume(compiler, TOKEN_EQ, "Expect '=' after variable name.");
-
     // Compile the initializer.
-    expression(compiler);
+    if (match(compiler, TOKEN_EQ))
+    {
+      expression(compiler);
+    }
+    else
+    {
+      // Default initialize it to null.
+      null(compiler, false);
+    }
 
     defineVariable(compiler, symbol);
     return;
diff --git a/test/variable/global_without_initializer.wren b/test/variable/global_without_initializer.wren
new file mode 100644
index 00000000..c63a2769
--- /dev/null
+++ b/test/variable/global_without_initializer.wren
@@ -0,0 +1,2 @@
+var a
+IO.write(a) // expect: null
diff --git a/test/variable/local_without_initializer.wren b/test/variable/local_without_initializer.wren
new file mode 100644
index 00000000..02a624d1
--- /dev/null
+++ b/test/variable/local_without_initializer.wren
@@ -0,0 +1,4 @@
+{
+  var a
+  IO.write(a) // expect: null
+}