diff --git a/Cargo.toml b/Cargo.toml
index a8d39eb..11f8066 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,9 +19,7 @@ edition = "2018"
 maintenance = { status = "actively-developed" }
 
 [dependencies]
-libc = "0.2"
 thread-id = "3.3"
-
 qadapt-macro = { version = "1.0.0", path = "./qadapt-macro" }
 qadapt-spin = { version = "1.0.0", path = "./qadapt-spin" }
 
diff --git a/appveyor.yml b/appveyor.yml
index 22b79fe..3a1153a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,14 +1,14 @@
 environment:
   matrix:
     # MinGW
-    # - TARGET: i686-pc-windows-gnu
-    #   RUST_VERSION: nightly
-    # - TARGET: x86_64-pc-windows-gnu
-    #   RUST_VERSION: nightly
+    - TARGET: i686-pc-windows-gnu
+      RUST_VERSION: nightly
+    - TARGET: x86_64-pc-windows-gnu
+      RUST_VERSION: nightly
 
     # MSVC
-    # - TARGET: i686-pc-windows-msvc
-    #   RUST_VERSION: nightly
+    - TARGET: i686-pc-windows-msvc
+      RUST_VERSION: nightly
     - TARGET: x86_64-pc-windows-msvc
       RUST_VERSION: nightly
     - TARGET: x86_64-pc-windows-msvc
diff --git a/src/lib.rs b/src/lib.rs
index 39690c7..ac8ff51 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -69,12 +69,10 @@ use thread_id;
 // Re-export the proc macros to use by other code
 pub use qadapt_macro::*;
 
-use libc::c_void;
-use libc::free;
-use libc::malloc;
 use qadapt_spin::RwLock;
 use std::alloc::GlobalAlloc;
 use std::alloc::Layout;
+use std::alloc::System;
 use std::thread;
 
 thread_local! {
@@ -94,6 +92,8 @@ thread_local! {
 /// ```
 pub struct QADAPT;
 
+static SYSTEM_ALLOC: System = System;
+
 /// Let QADAPT know that we are now entering a protected region and that
 /// panics should be triggered if allocations/drops happen while we are running.
 ///
@@ -286,7 +286,7 @@ unsafe impl GlobalAlloc for QADAPT {
         // If we're attempting to allocate our PROTECTION_LEVEL thread local,
         // just allow it through
         if alloc_immediate() {
-            return malloc(layout.size()) as *mut u8;
+            return SYSTEM_ALLOC.alloc(layout);
         }
 
         // Because accessing PROTECTION_LEVEL has the potential to trigger an allocation,
@@ -297,7 +297,7 @@ unsafe impl GlobalAlloc for QADAPT {
         release_internal_alloc();
 
         match protection_level {
-            Ok(v) if v == 0 => malloc(layout.size()) as *mut u8,
+            Ok(v) if v == 0 => SYSTEM_ALLOC.alloc(layout),
             Ok(v) => {
                 // Tripped a bad allocation, but make sure further memory access during unwind
                 // doesn't have issues
@@ -314,7 +314,7 @@ unsafe impl GlobalAlloc for QADAPT {
 
     unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
         if alloc_immediate() {
-            return free(ptr as *mut c_void);
+            return SYSTEM_ALLOC.dealloc(ptr, layout);
         }
 
         claim_internal_alloc();
@@ -323,7 +323,7 @@ unsafe impl GlobalAlloc for QADAPT {
         release_internal_alloc();
 
         // Free before checking panic to make sure we avoid leaks
-        free(ptr as *mut c_void);
+        SYSTEM_ALLOC.dealloc(ptr, layout);
         match protection_level {
             Ok(v) if v > 0 => {
                 // Tripped a bad drop, but make sure further memory access during unwind