diff --git a/config.h b/config.h
index d1fb9d43..63ba8670 100644
--- a/config.h
+++ b/config.h
@@ -524,7 +524,7 @@ NAMESPACE_END
 	#define CRYPTOPP_MM_MALLOC_AVAILABLE
 #elif defined(__APPLE__)
 	#define CRYPTOPP_APPLE_MALLOC_AVAILABLE
-#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
 	#define CRYPTOPP_MALLOC_ALIGNMENT_IS_16
 #elif defined(__linux__) || defined(__sun__) || defined(__CYGWIN__)
 	#define CRYPTOPP_MEMALIGN_AVAILABLE
@@ -615,7 +615,7 @@ NAMESPACE_END
 #define CRYPTOPP_UNIX_AVAILABLE
 #endif
 
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
 #define CRYPTOPP_BSD_AVAILABLE
 #endif