diff --git a/appveyor.yml b/appveyor.yml
index c35da8927ce..6dc33f30c7e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -104,7 +104,7 @@ environment:
     DEPLOY: 1
   - CI_JOB_NAME: dist-i686-mingw
     MSYS_BITS: 32
-    RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --enable-full-tools
+    RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu --enable-full-tools --enable-profiler
     SCRIPT: python x.py dist
     MINGW_URL: https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror
     MINGW_ARCHIVE: i686-6.3.0-release-posix-dwarf-rt_v5-rev2.7z
@@ -114,7 +114,7 @@ environment:
   - CI_JOB_NAME: dist-x86_64-mingw
     MSYS_BITS: 64
     SCRIPT: python x.py dist
-    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-full-tools
+    RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu --enable-full-tools --enable-profiler
     MINGW_URL: https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rust-ci-mirror
     MINGW_ARCHIVE: x86_64-6.3.0-release-posix-seh-rt_v5-rev2.7z
     MINGW_DIR: mingw64
diff --git a/src/libprofiler_builtins/build.rs b/src/libprofiler_builtins/build.rs
index 491986480de..0b2bda577d7 100644
--- a/src/libprofiler_builtins/build.rs
+++ b/src/libprofiler_builtins/build.rs
@@ -41,7 +41,11 @@ fn main() {
         cfg.flag("-fomit-frame-pointer");
         cfg.flag("-ffreestanding");
         cfg.define("VISIBILITY_HIDDEN", None);
-        cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
+        if !target.contains("windows") {
+            cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));
+        } else {
+            profile_sources.push("WindowsMMap.c");
+        }
     }
 
     // Assume that the Unixes we are building this for have fnctl() available