diff --git a/Makefile b/Makefile
index ba20b70194ec8..05b08bed94a49 100644
--- a/Makefile
+++ b/Makefile
@@ -323,6 +323,7 @@ $(eval $(call std_dll,gcc_s_seh-1))
 endif
 $(eval $(call std_dll,ssp-0))
 $(eval $(call std_dll,winpthread-1))
+$(eval $(call std_dll,atomic-1))
 endif
 define stringreplace
 	$(build_depsbindir)/stringreplace $$(strings -t x - $1 | grep '$2' | awk '{print $$1;}') '$3' 255 "$(call cygpath_w,$1)"
diff --git a/src/jitlayers.cpp b/src/jitlayers.cpp
index b816e3a6f2c56..defab5b11d16a 100644
--- a/src/jitlayers.cpp
+++ b/src/jitlayers.cpp
@@ -316,12 +316,17 @@ void NotifyDebugger(jit_code_entry *JITCodeEntry)
 }
 // ------------------------ END OF TEMPORARY COPY FROM LLVM -----------------
 
-#if defined(_OS_LINUX_)
+#if defined(_OS_LINUX_) || defined(_OS_WINDOWS_)
 // Resolve non-lock free atomic functions in the libatomic library.
 // This is the library that provides support for c11/c++11 atomic operations.
 static uint64_t resolve_atomic(const char *name)
 {
-    static void *atomic_hdl = jl_load_dynamic_library_e("libatomic",
+#if defined(_OS_LINUX_)
+    static const char *const libatomic = "libatomic";
+#elif defined(_OS_WINDOWS_)
+    static const char *const libatomic = "libatomic-1";
+#endif
+    static void *atomic_hdl = jl_load_dynamic_library_e(libatomic,
                                                         JL_RTLD_LOCAL);
     static const char *const atomic_prefix = "__atomic_";
     if (!atomic_hdl)
@@ -534,7 +539,7 @@ void JuliaOJIT::addModule(std::unique_ptr<Module> M)
                         // Step 2: Search the program symbols
                         if (uint64_t addr = SectionMemoryManager::getSymbolAddressInProcess(Name))
                             return JL_SymbolInfo(addr, JITSymbolFlags::Exported);
-#if defined(_OS_LINUX_)
+#if defined(_OS_LINUX_) || defined(_OS_WINDOWS_)
                         if (uint64_t addr = resolve_atomic(Name.c_str()))
                             return JL_SymbolInfo(addr, JITSymbolFlags::Exported);
 #endif
diff --git a/src/julia_internal.h b/src/julia_internal.h
index ac1eaa09a2b50..6b7fc807112a8 100644
--- a/src/julia_internal.h
+++ b/src/julia_internal.h
@@ -155,12 +155,9 @@ void gc_sweep_sysimg(void);
 static const int jl_gc_sizeclasses[JL_GC_N_POOLS] = {
 #ifdef _P64
     8,
-#elif defined(_CPU_ARM_) || defined(_CPU_PPC_) || defined(_CPU_X86_)
+#elif defined(_CPU_ARM_) || defined(_CPU_PPC_)
     // ARM and PowerPC have max alignment of 8,
     // make sure allocation of size 8 has that alignment.
-    // for x86 alignment is important for atomic ops and
-    // the corresponding platform ABI. Once we can use
-    // libatomic on Windows this is no longer necessary.
     4, 8,
 #else
     4, 8, 12,
@@ -196,7 +193,7 @@ STATIC_INLINE int jl_gc_alignment(size_t sz)
 #ifdef _P64
     (void)sz;
     return 16;
-#elif defined(_CPU_ARM_) || defined(_CPU_PPC_) || defined(_CPU_X86_)
+#elif defined(_CPU_ARM_) || defined(_CPU_PPC_)
     return sz <= 4 ? 8 : 16;
 #else
     // szclass 8
@@ -217,7 +214,7 @@ STATIC_INLINE int JL_CONST_FUNC jl_gc_szclass(size_t sz)
     if (sz <=    8)
         return 0;
     const int N = 0;
-#elif defined(_CPU_ARM_) || defined(_CPU_PPC_) || defined(_CPU_X86_)
+#elif defined(_CPU_ARM_) || defined(_CPU_PPC_)
     if (sz <=    8)
         return (sz + 3) / 4 - 1;
     const int N = 1;
diff --git a/src/julia_threads.h b/src/julia_threads.h
index 1051d740c8b85..cc4fd2479e2ae 100644
--- a/src/julia_threads.h
+++ b/src/julia_threads.h
@@ -62,7 +62,7 @@ typedef struct {
     // variables for allocating objects from pools
 #ifdef _P64
 #  define JL_GC_N_POOLS 41
-#elif defined(_CPU_ARM_) || defined(_CPU_PPC_) || defined(_CPU_X86_)
+#elif defined(_CPU_ARM_) || defined(_CPU_PPC_)
 #  define JL_GC_N_POOLS 42
 #else
 #  define JL_GC_N_POOLS 43