diff --git a/src/corelib/ipc/qsharedmemory_systemv.cpp b/src/corelib/ipc/qsharedmemory_systemv.cpp
index b14f5db39f..67d2375978 100644
--- a/src/corelib/ipc/qsharedmemory_systemv.cpp
+++ b/src/corelib/ipc/qsharedmemory_systemv.cpp
@@ -14,6 +14,7 @@
 #if QT_CONFIG(sysv_shm)
 #include <sys/types.h>
 #include <sys/ipc.h>
+#include <sys/mman.h>
 #include <sys/shm.h>
 #include <sys/stat.h>
 #include <fcntl.h>