diff --git a/mach/proto/ncg/codegen.c b/mach/proto/ncg/codegen.c
index 7157656f2..f214c87c4 100644
--- a/mach/proto/ncg/codegen.c
+++ b/mach/proto/ncg/codegen.c
@@ -256,7 +256,9 @@ if (Debug)
 	c3_p regcp[MAXCREG];
 	rl_p regls[MAXCREG];
 	c3_p cp,findcoerc();
+#ifdef MAXSPLIT
 	int sret;
+#endif
 	int stackpad;
 	struct perm *tup,*ntup,*besttup,*tuples();
 
diff --git a/mach/proto/ncg/reg.c b/mach/proto/ncg/reg.c
index 861b9419b..9ebdb8bf5 100644
--- a/mach/proto/ncg/reg.c
+++ b/mach/proto/ncg/reg.c
@@ -20,7 +20,9 @@ static char rcsid[] = "$Header$";
 
 chrefcount(regno,amount,tflag) {
 	register struct reginfo *rp;
+#if MAXMEMBERS != 0
 	register i;
+#endif
 
 	rp= &machregs[regno];
 #if MAXMEMBERS!=0
@@ -40,7 +42,9 @@ chrefcount(regno,amount,tflag) {
 
 getrefcount(regno) {
 	register struct reginfo *rp;
+#if MAXMEMBERS != 0
 	register i,maxcount;
+#endif
 
 	rp= &machregs[regno];
 #if MAXMEMBERS!=0
diff --git a/mach/proto/ncg/subr.c b/mach/proto/ncg/subr.c
index 2a57c2ce4..957ac974b 100644
--- a/mach/proto/ncg/subr.c
+++ b/mach/proto/ncg/subr.c
@@ -52,7 +52,9 @@ instance(instno,token) register token_p token; {
 	register inst_p inp;
 	int i;
 	register token_p tp;
+#if MAXMEMBERS != 0
 	struct reginfo *rp;
+#endif
 	int regno;
 	result_t result;
 
@@ -145,7 +147,9 @@ instance(instno,token) register token_p token; {
 cinstance(instno,token,tp,regno) register token_p token,tp; {
 	register inst_p inp;
 	int i;
+#if MAXMEMBERS != 0
 	struct reginfo *rp;
+#endif
 	result_t result;
 	int sh; /* saved stackheight */