diff --git a/libomptarget/src/api.cpp b/libomptarget/src/api.cpp
index 8a67754..15c1d2c 100644
--- a/libomptarget/src/api.cpp
+++ b/libomptarget/src/api.cpp
@@ -19,6 +19,7 @@
 
 #include <climits>
 #include <cstring>
+#include <cstdlib>
 
 EXTERN int omp_get_num_devices(void) {
   RTLsMtx.lock();
diff --git a/libomptarget/src/interface.cpp b/libomptarget/src/interface.cpp
index 2e0e496..a48d667 100644
--- a/libomptarget/src/interface.cpp
+++ b/libomptarget/src/interface.cpp
@@ -19,6 +19,7 @@
 #include "rtl.h"
 
 #include <cassert>
+#include <cstdlib>
 
 ////////////////////////////////////////////////////////////////////////////////
 /// adds a target shared library to the target execution image
diff --git a/libomptarget/src/rtl.cpp b/libomptarget/src/rtl.cpp
index 64a7f7f..3152528 100644
--- a/libomptarget/src/rtl.cpp
+++ b/libomptarget/src/rtl.cpp
@@ -16,6 +16,7 @@
 #include "rtl.h"
 
 #include <cassert>
+#include <cstdlib>
 #include <cstring>
 #include <dlfcn.h>
 #include <mutex>