diff --git a/BUILD.md b/BUILD.md
index 93db5b3a..b33523db 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -72,7 +72,9 @@ Build guide for VMG8825-B50B V5.17(ABNY.7)C0
    Clean and build the firmware
 
 	$ make dirclean
-	$ make -j${nproc} V=s
+	$ make -j1 V=sc
+	
+	It is important to compile with -j1 because forcing multicore can cause problems when compiling libjson-c
 
 
 6. The image is in the images directory.
diff --git a/build.sh b/build.sh
index 4b1730a7..ccf08c25 100755
--- a/build.sh
+++ b/build.sh
@@ -10,10 +10,10 @@ echo "Building Docker image ${IMAGE_NAME}..."
 docker build -t ${IMAGE_NAME} .
 
 echo "Starting container..."
-docker run --cpus="8" -it --name ${CONTAINER_NAME} \
+docker run --cpus="1" -it --name ${CONTAINER_NAME} \
   -e TERM=vt100 \
   ${IMAGE_NAME} \
-  /bin/bash -c "cd /home/builder/openwrt && bash"
+  /bin/bash -c "cd /home/builder/openwrt && make -j1 V=sc"
 
 docker cp ${CONTAINER_NAME}:.config ./.config-build
 docker cp ${CONTAINER_NAME}:defconfig.log ./defconfig-build.log