diff --git a/mlir/lib/ExecutionEngine/CRunnerUtils.cpp b/mlir/lib/ExecutionEngine/CRunnerUtils.cpp
index 7f800e8ea96ff..c31ae3a1c7ce1 100644
--- a/mlir/lib/ExecutionEngine/CRunnerUtils.cpp
+++ b/mlir/lib/ExecutionEngine/CRunnerUtils.cpp
@@ -16,7 +16,8 @@
 #include "mlir/ExecutionEngine/Msan.h"
 
 #ifndef _WIN32
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
+    defined(__DragonFly__)
 #include <cstdlib>
 #else
 #include <alloca.h>