diff --git a/dom/canvas/WebGLContextGL.cpp b/dom/canvas/WebGLContextGL.cpp
index 516f071878c0..1087f61de1e1 100644
--- a/dom/canvas/WebGLContextGL.cpp
+++ b/dom/canvas/WebGLContextGL.cpp
@@ -746,6 +746,8 @@ WebGLContext::GetFramebufferAttachmentParameter(JSContext* cx,
         MOZ_CRASH("Bad target.");
     }
 
+    MakeContextCurrent();
+
     if (fb)
         return fb->GetAttachmentParameter(funcName, cx, target, attachment, pname, &rv);