diff --git a/src/ext/ed25519/donna/ed25519-donna-portable-identify.h b/src/ext/ed25519/donna/ed25519-donna-portable-identify.h
index 3e0f9cfc502..7a487fda2b6 100644
--- a/src/ext/ed25519/donna/ed25519-donna-portable-identify.h
+++ b/src/ext/ed25519/donna/ed25519-donna-portable-identify.h
@@ -84,7 +84,8 @@
 #endif
 
 /* 64 bit cpu */
-#if defined(CPU_X86_64) || defined(CPU_IA64) || defined(CPU_SPARC64) || defined(__64BIT__) || defined(__LP64__) || defined(_LP64) || (defined(_MIPS_SZLONG) && (_MIPS_SZLONG == 64))
+#if defined(CPU_X86_64) || defined(CPU_IA64) || defined(CPU_SPARC64) || defined(__64BIT__) || defined(__LP64__) || defined(_LP64) || (defined(_MIPS_SZLONG) && (_MIPS_SZLONG == 64)) \
+	(defined(_LOONGARCH_SZLONG) && (_LOONGARCH_SZLONG == 64))
 	#define CPU_64BITS
 #endif