diff --git a/routers/api/v1/api.go b/routers/api/v1/api.go
index 9c21107a28..4c8426cbeb 100644
--- a/routers/api/v1/api.go
+++ b/routers/api/v1/api.go
@@ -197,6 +197,10 @@ func reqToken() func(ctx *context.APIContext) {
 			return
 		}
 		if ctx.IsSigned {
+			// Don't require token if already authenticated by reverse proxy.
+			if setting.Service.EnableReverseProxyAuth {
+				return
+			}
 			ctx.RequireCSRF()
 			return
 		}