diff --git a/lang/python27/Makefile b/lang/python27/Makefile
index 657e0625b8d9..9d7c8b461dc7 100644
--- a/lang/python27/Makefile
+++ b/lang/python27/Makefile
@@ -27,6 +27,7 @@ CONFIGURE_ENV+=		ac_cv_opt_olimit_ok=no OPT=""				# Null out OPT to respect user
 INSTALL_TARGET=		altinstall						# Don't want cloberring of unprefixed files
 MAKE_ARGS+=		INSTALL_SHARED="${INSTALL_LIB}"				# Strip shared library
 MAKE_ARGS+=		LIBPC="${PREFIX}/libdata/pkgconfig"			# Until pathfix gets support for files other than Makefile.in
+MAKE_JOBS_UNSAFE=	yes							# Parser/pgen build bug. See Issue: 200622, 201974
 
 PLIST_SUB=		ABI=${ABIFLAGS} \
 			PORTVERSION=${PORTVERSION} \
diff --git a/lang/python32/Makefile b/lang/python32/Makefile
index 3bbcf0816851..4a42a99724e0 100644
--- a/lang/python32/Makefile
+++ b/lang/python32/Makefile
@@ -28,6 +28,7 @@ CONFIGURE_ENV+=		OPT=""							# Null out OPT to respect user CFLAGS and remove o
 INSTALL_TARGET=		altinstall						# Don't want cloberring of unprefixed files
 MAKE_ARGS+=		INSTALL_SHARED="${INSTALL_LIB}"				# Strip shared library
 MAKE_ARGS+=		LIBPC="${PREFIX}/libdata/pkgconfig"			# Until pathfix gets support for files other than Makefile.in
+MAKE_JOBS_UNSAFE=	yes							# Parser/pgen build bug. See Issue: 200622, 201974
 
 PLIST_SUB=		ABI=${ABIFLAGS} \
 			OSMAJOR=${OSVERSION:C/([0-9]*)[0-9]{5}/\1/}		# For plat-freebsd* in pkg-plist. http://bugs.python.org/issue19554
diff --git a/lang/python33/Makefile b/lang/python33/Makefile
index 1755b4c376d0..d76d501fe946 100644
--- a/lang/python33/Makefile
+++ b/lang/python33/Makefile
@@ -28,6 +28,7 @@ CONFIGURE_ENV+=		OPT=""							# Null out OPT to respect user CFLAGS and remove o
 INSTALL_TARGET=		altinstall						# Don't want cloberring of unprefixed files
 MAKE_ARGS+=		INSTALL_SHARED="${INSTALL_LIB}"				# Strip shared library
 MAKE_ARGS+=		LIBPC="${PREFIX}/libdata/pkgconfig"			# Until pathfix gets support for files other than Makefile.in
+MAKE_JOBS_UNSAFE=	yes							# Parser/pgen build bug. See Issue: 200622, 201974
 
 PLIST_SUB=		ABI=${ABIFLAGS} \
 			OSMAJOR=${OSVERSION:C/([0-9]*)[0-9]{5}/\1/}		# For plat-freebsd* in pkg-plist. http://bugs.python.org/issue19554
diff --git a/lang/python34/Makefile b/lang/python34/Makefile
index 35b9724620eb..9ca5f3950bc0 100644
--- a/lang/python34/Makefile
+++ b/lang/python34/Makefile
@@ -30,6 +30,7 @@ CONFIGURE_ENV+=		OPT="" DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS}"	# Null out
 INSTALL_TARGET=		altinstall						# Don't want cloberring of unprefixed files
 MAKE_ARGS+=		INSTALL_SHARED="${INSTALL_LIB}"				# Strip shared library
 MAKE_ARGS+=		LIBPC="${PREFIX}/libdata/pkgconfig"			# Until pathfix gets support for files other than Makefile.in
+MAKE_JOBS_UNSAFE=	yes							# Parser/pgen build bug. See Issue: 200622, 201974
 
 PLIST_SUB=		ABI=${ABIFLAGS} \
 			OSMAJOR=${OSVERSION:C/([0-9]*)[0-9]{5}/\1/}		# For plat-freebsd* in pkg-plist. http://bugs.python.org/issue19554