diff --git a/CMakeLists.txt b/CMakeLists.txt
index c818811d8ff..3326eae4168 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -418,11 +418,13 @@ if(${WITH_PARMYS}) # define cmake params to compile Yosys
         set(MAKE_PROGRAM "make")
     endif()
 
-    if(NOT DEFINED "${CMAKE_BUILD_PARALLEL_LEVEL}")
-        set(CUSTOM_BUILD_PARALLEL_LEVEL 16)
-    else()
-        set(CUSTOM_BUILD_PARALLEL_LEVEL "${CMAKE_BUILD_PARALLEL_LEVEL}")
-    endif()
+    # Commented out since a make file should not call another make command with
+    # threads. It should pass this information from the parent automatically.
+    # if(NOT DEFINED "${CMAKE_BUILD_PARALLEL_LEVEL}")
+    #     set(CUSTOM_BUILD_PARALLEL_LEVEL 16)
+    # else()
+    #     set(CUSTOM_BUILD_PARALLEL_LEVEL "${CMAKE_BUILD_PARALLEL_LEVEL}")
+    # endif()
     add_subdirectory(yosys)
 endif()
 
diff --git a/yosys/CMakeLists.txt b/yosys/CMakeLists.txt
index dd13b7c49ae..455e575cc99 100644
--- a/yosys/CMakeLists.txt
+++ b/yosys/CMakeLists.txt
@@ -20,7 +20,7 @@ add_custom_command(OUTPUT yosys-bin
 #            -C ${CMAKE_CURRENT_BINARY_DIR}
 #            -f ${CMAKE_CURRENT_SOURCE_DIR}/Makefile #(out-of-tree) build directory
             PREFIX=${CMAKE_BINARY_DIR}
-            -j${CUSTOM_BUILD_PARALLEL_LEVEL}
+#            -j${CUSTOM_BUILD_PARALLEL_LEVEL}
             > /dev/null
 
         COMMAND ${MAKE_PROGRAM} install ENABLE_ABC=0
@@ -43,4 +43,4 @@ add_custom_target(yosys ALL DEPENDS yosys-bin)
 #        INTERFACE_INCLUDE_DIRECTORIES ${YOSYS_INCLUDE_DIRS})
 
 
-#install(FILES ${BINARY_LIB_FILE1} DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
\ No newline at end of file
+#install(FILES ${BINARY_LIB_FILE1} DESTINATION ${CMAKE_CURRENT_BINARY_DIR})