diff --git a/src/backends.jl b/src/backends.jl
index 1864a62c..da0b7666 100644
--- a/src/backends.jl
+++ b/src/backends.jl
@@ -195,7 +195,7 @@ const _deprecated_backends = [:qwt, :winston, :bokeh, :gadfly, :immerse, :glvisu
 function warn_on_deprecated_backend(bsym::Symbol)
     if bsym in _deprecated_backends
 	    if bsym == :pgfplots
-			@warn("Backend $bsym has been deprecated. Use pgfplotsx instead.")
+            @warn("Backend $bsym has been deprecated. Use pgfplotsx instead.")
 	    else
         	@warn("Backend $bsym has been deprecated.")
 	    end