diff --git a/cde/programs/dthelp/parser/canon1/build/Makefile.am b/cde/programs/dthelp/parser/canon1/build/Makefile.am
index e82964b05..7b169c3bb 100644
--- a/cde/programs/dthelp/parser/canon1/build/Makefile.am
+++ b/cde/programs/dthelp/parser/canon1/build/Makefile.am
@@ -1,5 +1,7 @@
 MAINTAINERCLEANFILES = Makefile.in
 
+.NOTPARALLEL:
+
 noinst_PROGRAMS = build
 
 HELPTAG       = ..
diff --git a/cde/programs/dthelp/parser/pass2/build/Makefile.am b/cde/programs/dthelp/parser/pass2/build/Makefile.am
index 582bb0f43..c2fc5e0b0 100644
--- a/cde/programs/dthelp/parser/pass2/build/Makefile.am
+++ b/cde/programs/dthelp/parser/pass2/build/Makefile.am
@@ -1,5 +1,7 @@
 MAINTAINERCLEANFILES = Makefile.in
 
+.NOTPARALLEL:
+
 noinst_PROGRAMS = build
 
 HTAG2       = ..