diff --git a/src/add-ons/kernel/partitioning_systems/session/Debug.cpp b/src/add-ons/kernel/partitioning_systems/session/Debug.cpp
index fc1897b078..c845ec3c7d 100644
--- a/src/add-ons/kernel/partitioning_systems/session/Debug.cpp
+++ b/src/add-ons/kernel/partitioning_systems/session/Debug.cpp
@@ -16,6 +16,8 @@
 #include <KernelExport.h>
 #include <TLS.h>
 
+#include <string.h>
+
 //----------------------------------------------------------------------
 // Long-winded overview of the debug output macros:
 //----------------------------------------------------------------------