diff --git a/MozillaFirefox.changes b/MozillaFirefox.changes
index 0c52eec..d75b3c0 100644
--- a/MozillaFirefox.changes
+++ b/MozillaFirefox.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Oct 18 12:44:44 UTC 2021 - Guillaume GARDET <guillaume.gardet@opensuse.org>
+
+- Add patch to fix build on aarch64 - bmo#1729124 
+  * mozilla-bmo1729124.patch
+
 -------------------------------------------------------------------
 Fri Oct  1 18:33:33 UTC 2021 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/MozillaFirefox.spec b/MozillaFirefox.spec
index 8e2133d..4a4e09d 100644
--- a/MozillaFirefox.spec
+++ b/MozillaFirefox.spec
@@ -227,6 +227,7 @@ Patch28:        mozilla-libavcodec58_91.patch
 Patch29:        mozilla-silence-no-return-type.patch
 Patch30:        mozilla-bmo1725828.patch
 Patch31:        mozilla-bmo531915.patch
+Patch32:        mozilla-bmo1729124.patch
 # Firefox/browser
 Patch101:       firefox-kde.patch
 Patch102:       firefox-branded-icons.patch
@@ -357,6 +358,7 @@ cd $RPM_BUILD_DIR/%{srcname}-%{orig_version}
 %patch29 -p1
 %patch30 -p1
 %patch31 -p1
+%patch32 -p1
 # Firefox
 %patch101 -p1
 %patch102 -p1
diff --git a/mozilla-bmo1729124.patch b/mozilla-bmo1729124.patch
new file mode 100644
index 0000000..3a6b27e
--- /dev/null
+++ b/mozilla-bmo1729124.patch
@@ -0,0 +1,50 @@
+
+# HG changeset patch
+# User Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
+# Date 1631000649 0
+# Node ID eac40293649628d32911c909219d514bebb8ce63
+# Parent  6582d77235867224aaf8621bad8ee167dfb31460
+Bug 1729124 - [MIPS64][ARM64] Fix gcc build issue. r=lth
+
+The SpecificRegs struct needs a constructor.
+
+Differential Revision: https://phabricator.services.mozilla.com/D124535
+
+diff --git a/js/src/wasm/WasmBCRegDefs.h b/js/src/wasm/WasmBCRegDefs.h
+--- a/js/src/wasm/WasmBCRegDefs.h
++++ b/js/src/wasm/WasmBCRegDefs.h
+@@ -374,25 +374,31 @@ struct SpecificRegs {
+ };
+ #elif defined(JS_CODEGEN_ARM)
+ struct SpecificRegs {
+   RegI64 abiReturnRegI64;
+ 
+   SpecificRegs() : abiReturnRegI64(ReturnReg64) {}
+ };
+ #elif defined(JS_CODEGEN_ARM64)
+-struct SpecificRegs {};
++struct SpecificRegs {
++  // Required by gcc.
++  SpecificRegs() {}
++};
+ #elif defined(JS_CODEGEN_MIPS32)
+ struct SpecificRegs {
+   RegI64 abiReturnRegI64;
+ 
+   SpecificRegs() : abiReturnRegI64(ReturnReg64) {}
+ };
+ #elif defined(JS_CODEGEN_MIPS64)
+-struct SpecificRegs {};
++struct SpecificRegs {
++  // Required by gcc.
++  SpecificRegs() {}
++};
+ #else
+ struct SpecificRegs {
+ #  ifndef JS_64BIT
+   RegI64 abiReturnRegI64;
+ #  endif
+ 
+   SpecificRegs() { MOZ_CRASH("BaseCompiler porting interface: SpecificRegs"); }
+ };
+