diff --git a/libstdc++-v3/src/nonshared98/extfloat.S b/libstdc++-v3/src/nonshared98/extfloat.S
index b6e4164b5..bedada6d8 100644
--- a/libstdc++-v3/src/nonshared98/extfloat.S
+++ b/libstdc++-v3/src/nonshared98/extfloat.S
@@ -56,8 +56,12 @@
 #elif defined __riscv && __riscv_xlen == 64
 #define ALIGN1	.align 3
 #define ALIGN3	.align 3
+#elif defined __loongarch64
+#define ALIGN1	.align 3
+#define ALIGN3	.align 3
 #endif
-#if defined __x86_64__ || defined __powerpc64__ || defined __s390x__ || defined __ia64__ || defined __aarch64__ || (defined __riscv && __riscv_xlen == 64)
+#if defined __x86_64__ || defined __powerpc64__ || defined __s390x__ || defined __ia64__ || defined __aarch64__ || (defined __riscv && __riscv_xlen == 64) \
+    || defined __loongarch64
 #define SIZE1	32
 #define SIZE2	16
 #define OFF	16