diff --git a/src/corelib/ipc/qsharedmemory_posix.cpp b/src/corelib/ipc/qsharedmemory_posix.cpp
index c2c0bff07bf..313b34a5946 100644
--- a/src/corelib/ipc/qsharedmemory_posix.cpp
+++ b/src/corelib/ipc/qsharedmemory_posix.cpp
@@ -27,7 +27,7 @@ using namespace QtIpcCommon;
 bool QSharedMemoryPosix::runtimeSupportCheck()
 {
     static const bool result = []() {
-        shm_open("", 0, 0);         // this WILL fail
+        (void)shm_open("", 0, 0);         // this WILL fail
         return errno != ENOSYS;
     }();
     return result;
diff --git a/src/corelib/ipc/qsharedmemory_systemv.cpp b/src/corelib/ipc/qsharedmemory_systemv.cpp
index 385ffdd5975..18bcc708de0 100644
--- a/src/corelib/ipc/qsharedmemory_systemv.cpp
+++ b/src/corelib/ipc/qsharedmemory_systemv.cpp
@@ -36,7 +36,7 @@ bool QSharedMemorySystemV::runtimeSupportCheck()
         return false;
 #endif
     static const bool result = []() {
-        shmget(IPC_PRIVATE, ~size_t(0), 0);     // this will fail
+        (void)shmget(IPC_PRIVATE, ~size_t(0), 0);     // this will fail
         return errno != ENOSYS;
     }();
     return result;
diff --git a/src/corelib/ipc/qsystemsemaphore_systemv.cpp b/src/corelib/ipc/qsystemsemaphore_systemv.cpp
index 3d73a622623..cdfa6adfd48 100644
--- a/src/corelib/ipc/qsystemsemaphore_systemv.cpp
+++ b/src/corelib/ipc/qsystemsemaphore_systemv.cpp
@@ -40,7 +40,7 @@ bool QSystemSemaphoreSystemV::runtimeSupportCheck()
         return false;
 #endif
     static const bool result = []() {
-        semget(IPC_PRIVATE, -1, 0);     // this will fail
+        (void)semget(IPC_PRIVATE, -1, 0);     // this will fail
         return errno != ENOSYS;
     }();
     return result;