diff --git a/libraries/source/spidermonkey/patches/FixWinHeap.diff b/libraries/source/spidermonkey/patches/FixWinHeap.diff
new file mode 100644
index 0000000000..1eb7022737
--- /dev/null
+++ b/libraries/source/spidermonkey/patches/FixWinHeap.diff
@@ -0,0 +1,41 @@
+
+# HG changeset patch
+# User Mike Hommey <mh+mozilla@glandium.org>
+# Date 1684810882 0
+# Node ID 9c84e12328a105874d1769800bb132e78befc8b2
+# Parent  1e6bdb2d359480234077ac0ec5592dced8184921
+Bug 1802675 - Don't build winheap.cpp when mozglue is a static library. r=firefox-build-system-reviewers,andi
+
+Differential Revision: https://phabricator.services.mozilla.com/D163383
+
+diff --git a/memory/mozalloc/moz.build b/memory/mozalloc/moz.build
+--- a/memory/mozalloc/moz.build
++++ b/memory/mozalloc/moz.build
+@@ -17,20 +17,22 @@ if CONFIG["WRAP_STL_INCLUDES"]:
+         EXPORTS.mozilla += ["throw_gcc.h"]
+     elif CONFIG["CC_TYPE"] == "clang-cl":
+         DEFINES["_HAS_EXCEPTIONS"] = 0
+         SOURCES += [
+             "msvc_raise_wrappers.cpp",
+         ]
+ 
+ if CONFIG["OS_TARGET"] == "WINNT":
+-    # Keep this file separate to avoid #include'ing windows.h everywhere.
+-    SOURCES += [
+-        "winheap.cpp",
+-    ]
++    # Don't build winheap.cpp when mozglue is a static library.
++    if CONFIG["MOZ_MEMORY"] or not CONFIG["JS_STANDALONE"]:
++        # Keep this file separate to avoid #include'ing windows.h everywhere.
++        SOURCES += [
++            "winheap.cpp",
++        ]
+ 
+ UNIFIED_SOURCES += [
+     "mozalloc.cpp",
+     "mozalloc_oom.cpp",
+ ]
+ 
+ SOURCES += [
+     "mozalloc_abort.cpp",
+
diff --git a/libraries/source/spidermonkey/patches/patch.sh b/libraries/source/spidermonkey/patches/patch.sh
index de93c1d1e2..e0cd5ca85d 100755
--- a/libraries/source/spidermonkey/patches/patch.sh
+++ b/libraries/source/spidermonkey/patches/patch.sh
@@ -14,6 +14,10 @@ patch -p1 <"${PATCHES}"/FixRustLinkage.diff
 # Differentiate debug/release library names.
 patch -p1 <"${PATCHES}"/FixLibNames.diff
 
+# Fix Windows build, fixed in ESR 115
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1802675
+patch -p1 <"${PATCHES}"/FixWinHeap.diff
+
 # There is an issue on 32-bit linux builds sometimes.
 # NB: the patch here is Comment 21 modified by Comment 25
 # but that seems to imperfectly fix the issue with GCC.