diff --git a/mail-client/thunderbird/thunderbird-102.4.0.ebuild b/mail-client/thunderbird/thunderbird-102.4.0.ebuild
index eb9b1b7dc0fe8..67f10b0179dcc 100644
--- a/mail-client/thunderbird/thunderbird-102.4.0.ebuild
+++ b/mail-client/thunderbird/thunderbird-102.4.0.ebuild
@@ -574,7 +574,6 @@ src_configure() {
 			have_switched_compiler=yes
 		fi
 		AR=llvm-ar
-		AS="clang -c"
 		CC=${CHOST}-clang
 		CXX=${CHOST}-clang++
 		NM=llvm-nm
@@ -599,6 +598,7 @@ src_configure() {
 	# Ensure we use correct toolchain
 	export HOST_CC="$(tc-getBUILD_CC)"
 	export HOST_CXX="$(tc-getBUILD_CXX)"
+	export AS="$(tc-getCC) -c"
 	tc-export CC CXX LD AR AS NM OBJDUMP RANLIB PKG_CONFIG
 
 	# Pass the correct toolchain paths through cbindgen
diff --git a/mail-client/thunderbird/thunderbird-102.4.2.ebuild b/mail-client/thunderbird/thunderbird-102.4.2.ebuild
index 831f69b6d8f2d..1dfca9adeb822 100644
--- a/mail-client/thunderbird/thunderbird-102.4.2.ebuild
+++ b/mail-client/thunderbird/thunderbird-102.4.2.ebuild
@@ -574,7 +574,6 @@ src_configure() {
 			have_switched_compiler=yes
 		fi
 		AR=llvm-ar
-		AS="clang -c"
 		CC=${CHOST}-clang
 		CXX=${CHOST}-clang++
 		NM=llvm-nm
@@ -599,6 +598,7 @@ src_configure() {
 	# Ensure we use correct toolchain
 	export HOST_CC="$(tc-getBUILD_CC)"
 	export HOST_CXX="$(tc-getBUILD_CXX)"
+	export AS="$(tc-getCC) -c"
 	tc-export CC CXX LD AR AS NM OBJDUMP RANLIB PKG_CONFIG
 
 	# Pass the correct toolchain paths through cbindgen