diff --git a/backends/open62541/src/ServerContext.c b/backends/open62541/src/ServerContext.c
index 8e7fd8e..d94f69f 100644
--- a/backends/open62541/src/ServerContext.c
+++ b/backends/open62541/src/ServerContext.c
@@ -6,6 +6,7 @@
  */
 
 #include "ServerContext.h"
+#include <stdlib.h>
 
 struct ServerContext
 {
diff --git a/include/NodesetLoader/NodesetLoader.h b/include/NodesetLoader/NodesetLoader.h
index 2f096c9..4e70e5e 100644
--- a/include/NodesetLoader/NodesetLoader.h
+++ b/include/NodesetLoader/NodesetLoader.h
@@ -21,6 +21,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #ifdef __cplusplus
 extern "C" {