diff --git a/Configurations/unix-Makefile.tmpl b/Configurations/unix-Makefile.tmpl
index 1292053..9f8257f 100644
--- a/Configurations/unix-Makefile.tmpl
+++ b/Configurations/unix-Makefile.tmpl
@@ -1,3 +1,4 @@
+.NOTPARALLEL:
 ##
 ## Makefile for OpenSSL
 ##
diff --git a/Configurations/windows-makefile.tmpl b/Configurations/windows-makefile.tmpl
index 8ef70b8..2a05e84 100644
--- a/Configurations/windows-makefile.tmpl
+++ b/Configurations/windows-makefile.tmpl
@@ -1,3 +1,4 @@
+.NOTPARALLEL:
 ##
 ## Makefile for OpenSSL
 ##
