diff --git a/mach/ns/libbc/Makefile b/mach/ns/libbc/Makefile
index 225d81736..334a774c1 100644
--- a/mach/ns/libbc/Makefile
+++ b/mach/ns/libbc/Makefile
@@ -1,5 +1,6 @@
+SUF=o
 MAKEFILE=../../proto/libg/Makefile
-MACHDEF="MACH=ns" "SUF=o" "ASAR=aal"
+MACHDEF="MACH=ns" "SUF=$(SUF)" "ASAR=aal"
 BCDEF="PREF=bc" "SUB=" "SRC=lang/basic/lib"
 
 install:
diff --git a/mach/ns/libpc/Makefile b/mach/ns/libpc/Makefile
index 0c68be578..d4a03084e 100644
--- a/mach/ns/libpc/Makefile
+++ b/mach/ns/libpc/Makefile
@@ -1,5 +1,6 @@
+SUF=o
 MAKEFILE=../../proto/libg/Makefile
-MACHDEF="MACH=ns" "SUF=o" "ASAR=aal"
+MACHDEF="MACH=ns" "SUF=$(SUF)" "ASAR=aal"
 PCDEF="PREF=pc" "SUB=" "SRC=lang/pc/libpc"
 
 install: