diff --git a/.travis.yml b/.travis.yml
index c243f3f6..77820b44 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,26 +9,6 @@ env:
 
 matrix:
   include:
-    # Stable channel
-    - os: osx
-      env: TARGET=i686-apple-darwin CHANNEL=stable
-    - os: linux
-      env: TARGET=i686-unknown-linux-gnu CHANNEL=stable
-      addons:
-        apt:
-          packages: &i686_unknown_linux_gnu
-            - gcc-multilib
-    - os: osx
-      env: TARGET=x86_64-apple-darwin CHANNEL=stable
-    - os: linux
-      env: TARGET=x86_64-unknown-linux-gnu CHANNEL=stable
-      addons:
-        apt:
-          packages:
-            - nodejs
-            - npm
-    - os: linux
-      env: TARGET=x86_64-unknown-linux-musl CHANNEL=stable
     # Beta channel
     - os: osx
       env: TARGET=i686-apple-darwin CHANNEL=beta
@@ -58,6 +38,28 @@ matrix:
     - os: linux
       env: TARGET=x86_64-unknown-linux-musl CHANNEL=nightly
 
+    # Not testing on stable channel until proc_macro lands there in the next release.
+    # # Stable channel
+    # - os: osx
+    #   env: TARGET=i686-apple-darwin CHANNEL=stable
+    # - os: linux
+    #   env: TARGET=i686-unknown-linux-gnu CHANNEL=stable
+    #   addons:
+    #     apt:
+    #       packages: &i686_unknown_linux_gnu
+    #         - gcc-multilib
+    # - os: osx
+    #   env: TARGET=x86_64-apple-darwin CHANNEL=stable
+    # - os: linux
+    #   env: TARGET=x86_64-unknown-linux-gnu CHANNEL=stable
+    #   addons:
+    #     apt:
+    #       packages:
+    #         - nodejs
+    #         - npm
+    # - os: linux
+    #   env: TARGET=x86_64-unknown-linux-musl CHANNEL=stable
+
   # Musl builds fail due to a bug in Rust (https://github.com/azerupi/mdBook/issues/158)
   allow_failures:
     - os: linux
diff --git a/appveyor.yml b/appveyor.yml
index 87da24ce..1f17eb7b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -2,11 +2,6 @@ environment:
   global:
     PROJECT_NAME: mdBook
   matrix:
-    # Stable channel
-    - TARGET: i686-pc-windows-msvc
-      RUST_CHANNEL: stable
-    - TARGET: x86_64-pc-windows-msvc
-      RUST_CHANNEL: stable
     # Beta channel
     - TARGET: i686-pc-windows-msvc
       RUST_CHANNEL: beta
@@ -18,6 +13,13 @@ environment:
     - TARGET: x86_64-pc-windows-msvc
       RUST_CHANNEL: nightly
 
+# Not testing on stable channel until proc_macro lands there in the next release.
+#    # Stable channel
+#    - TARGET: i686-pc-windows-msvc
+#      RUST_CHANNEL: stable
+#    - TARGET: x86_64-pc-windows-msvc
+#      RUST_CHANNEL: stable
+
 # Install Rust and Cargo
 install:
   - ps: Start-FileDownload "https://static.rust-lang.org/dist/channel-rust-stable"