diff --git a/test/appveyor.yml b/test/appveyor.yml
index 9024afa..040180f 100644
--- a/test/appveyor.yml
+++ b/test/appveyor.yml
@@ -36,23 +36,23 @@ environment:
       TOOLSET: msvc-14.1 #,clang-win
       CXXSTD: 14,17
       ADDRMD: 64
-    #- APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    #  ADDPATH: C:\cygwin\bin;
-    #  TOOLSET: gcc
-    #  CXXSTD: 03,11,14,1z
-    #- APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    #  ADDPATH: C:\cygwin64\bin;
-    #  TOOLSET: gcc
-    #  CXXSTD: 03,11,14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\cygwin\bin;
+      TOOLSET: gcc
+      CXXSTD: 11,14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\cygwin64\bin;
+      TOOLSET: gcc
+      CXXSTD: 11,14,1z
     # Waiting for https://github.com/boostorg/system/issues/116
-    #- APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    #  ADDPATH: C:\mingw\bin;
-    #  TOOLSET: gcc
-    #  CXXSTD: 03,11,14,1z
-    #- APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    #  ADDPATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;
-    #  TOOLSET: gcc
-    #  CXXSTD: 03,11,14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\mingw\bin;
+      TOOLSET: gcc
+      CXXSTD: 11,14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;
+      TOOLSET: gcc
+      CXXSTD: 03,11,14,1z
 
 before_build:
     - set BOOST_BRANCH=develop