diff --git a/src/OpenThreads/pthreads/CMakeLists.txt b/src/OpenThreads/pthreads/CMakeLists.txt
index 8eae948b7..11b9a47f3 100644
--- a/src/OpenThreads/pthreads/CMakeLists.txt
+++ b/src/OpenThreads/pthreads/CMakeLists.txt
@@ -11,12 +11,12 @@ SET(LIB_PUBLIC_HEADERS ${OpenThreads_PUBLIC_HEADERS})
 ADD_LIBRARY(${LIB_NAME}
     ${OPENTHREADS_USER_DEFINED_DYNAMIC_OR_STATIC}
     ${LIB_PUBLIC_HEADERS}
-    PThread.c++
-    PThreadBarrier.c++
+    PThread.cpp
+    PThreadBarrier.cpp
     PThreadBarrierPrivateData.h
-    PThreadCondition.c++
+    PThreadCondition.cpp
     PThreadConditionPrivateData.h
-    PThreadMutex.c++
+    PThreadMutex.cpp
     PThreadMutexPrivateData.h
     PThreadPrivateData.h
     ../common/Version.cpp
diff --git a/src/OpenThreads/pthreads/PThread.c++ b/src/OpenThreads/pthreads/PThread.cpp
similarity index 100%
rename from src/OpenThreads/pthreads/PThread.c++
rename to src/OpenThreads/pthreads/PThread.cpp
diff --git a/src/OpenThreads/pthreads/PThreadBarrier.c++ b/src/OpenThreads/pthreads/PThreadBarrier.cpp
similarity index 100%
rename from src/OpenThreads/pthreads/PThreadBarrier.c++
rename to src/OpenThreads/pthreads/PThreadBarrier.cpp
diff --git a/src/OpenThreads/pthreads/PThreadCondition.c++ b/src/OpenThreads/pthreads/PThreadCondition.cpp
similarity index 100%
rename from src/OpenThreads/pthreads/PThreadCondition.c++
rename to src/OpenThreads/pthreads/PThreadCondition.cpp
diff --git a/src/OpenThreads/pthreads/PThreadMutex.c++ b/src/OpenThreads/pthreads/PThreadMutex.cpp
similarity index 100%
rename from src/OpenThreads/pthreads/PThreadMutex.c++
rename to src/OpenThreads/pthreads/PThreadMutex.cpp