diff --git a/srcpkgs/thunderbird/patches/fix-i386-fdlibm.patch b/srcpkgs/thunderbird/patches/fix-i386-fdlibm.patch
new file mode 100644
index 0000000000..831e5e0367
--- /dev/null
+++ b/srcpkgs/thunderbird/patches/fix-i386-fdlibm.patch
@@ -0,0 +1,18 @@
+# error: typedef redefinition with different types ('__double_t' (aka 'double') vs 'long double')
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1729459
+
+--- a/modules/fdlibm/src/math_private.h
++++ b/modules/fdlibm/src/math_private.h
+@@ -30,7 +30,12 @@
+  * Adapted from https://github.com/freebsd/freebsd-src/search?q=__double_t
+  */
+ 
++#if defined(__linux__) && defined(__i386__)
++// rely on glibc's double_t
++typedef long double __double_t;
++#else
+ typedef double      __double_t;
++#endif
+ typedef __double_t  double_t;
+ 
+ /*