diff --git a/Makefile b/Makefile
index 1647ac4c6..82c4cadd6 100644
--- a/Makefile
+++ b/Makefile
@@ -111,10 +111,15 @@ endif
 
 # RLIMIT_MEMLOCK came in BSD, is not specified in POSIX.1,
 # and on macOS its availability depends on enabling Darwin extensions
+# similarly on DragonFly, enabling BSD extensions is necessary
 ifeq ($(UNAME_S),Darwin)
 	MK_CFLAGS   += -D_DARWIN_C_SOURCE
 	MK_CXXFLAGS += -D_DARWIN_C_SOURCE
 endif
+ifeq ($(UNAME_S),DragonFly)
+	MK_CFLAGS   += -D__BSD_VISIBLE
+	MK_CXXFLAGS += -D__BSD_VISIBLE
+endif
 
 ifdef LLAMA_DEBUG
 	MK_CFLAGS   += -O0 -g