diff --git a/srcpkgs/firefox-esr/patches/fix-i686-musl.patch b/srcpkgs/firefox-esr/patches/fix-i686-musl.patch
new file mode 100644
index 0000000000..5345a3cd3d
--- /dev/null
+++ b/srcpkgs/firefox-esr/patches/fix-i686-musl.patch
@@ -0,0 +1,20 @@
+--- mozglue/misc/StackWalk.cpp	2017-04-11 04:13:21.000000000 +0200
++++ mozglue/misc/StackWalk.cpp	2017-11-29 15:23:07.218649970 +0100
+@@ -41,7 +41,7 @@
+ #define MOZ_STACKWALK_SUPPORTS_MACOSX 0
+ #endif
+ 
+-#if (defined(linux) && \
++#if defined(__GLIBC__) && (defined(linux) && \
+      ((defined(__GNUC__) && (defined(__i386) || defined(PPC))) || \
+       defined(HAVE__UNWIND_BACKTRACE)))
+ #define MOZ_STACKWALK_SUPPORTS_LINUX 1
+@@ -911,7 +911,7 @@
+ }
+ 
+ // {x86, ppc} x {Linux, Mac} stackwalking code.
+-#if ((defined(__i386) || defined(PPC) || defined(__ppc__)) && \
++#if defined(__GLIBC__) && ((defined(__i386) || defined(PPC) || defined(__ppc__)) && \
+      (MOZ_STACKWALK_SUPPORTS_MACOSX || MOZ_STACKWALK_SUPPORTS_LINUX))
+ 
+ MFBT_API bool