diff --git a/CMakeLists.txt b/CMakeLists.txt
index 295591b3..ac3b5853 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,10 @@ set(CMAKE_DEBUG_POSTFIX "-dbg")
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -Wall -Wno-unused-function")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unused-function")
 
+if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-vla-cxx-extension")
+endif()
+
 if(BUILD_PYTHON_MODULE)
     # Build PIC code to be used for swig/python module
     set(CMAKE_POSITION_INDEPENDENT_CODE ON)
diff --git a/include/parpeamici/amiciSimulationRunner.h b/include/parpeamici/amiciSimulationRunner.h
index 1193a591..2710c8a6 100644
--- a/include/parpeamici/amiciSimulationRunner.h
+++ b/include/parpeamici/amiciSimulationRunner.h
@@ -26,7 +26,7 @@
 
 namespace parpe {
 
-class JobData;
+struct JobData;
 #ifdef PARPE_ENABLE_MPI
 class LoadBalancerMaster;
 #else