diff --git a/cmake/qeHelpers.cmake b/cmake/qeHelpers.cmake
index 942e9d266..0fe1a0b5e 100644
--- a/cmake/qeHelpers.cmake
+++ b/cmake/qeHelpers.cmake
@@ -42,7 +42,7 @@ function(qe_preprocess_source IN OUT)
     endif()
     add_custom_command(
         OUTPUT ${OUT}
-        COMMAND "${CMAKE_Fortran_COMPILER}" ${f_cpp_flag} ${global_flags} -E ${IN} -o ${OUT}
+        COMMAND "${CMAKE_Fortran_COMPILER}" ${f_cpp_flag} ${global_flags} -E ${IN} > ${OUT}
         MAIN_DEPENDENCY ${IN}
         COMMENT "Preprocessing ${IN}"
         VERBATIM)    
@@ -141,4 +141,4 @@ endfunction(qe_ensure_build_type)
 
 if(TARGET QEGlobalCompileDefinitions)
     qe_install_targets(QEGlobalCompileDefinitions)
-endif()
\ No newline at end of file
+endif()