diff --git a/Makefile.in b/Makefile.in
index 82124cb..6ec0f7d 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -46,10 +46,10 @@ poundctl:	poundctl.o
 		${CC} @LDFLAGS@ -o poundctl poundctl.o $(LIBS)
 
 dh512.h:
-		openssl dhparam -5 -C -noout 512 > dh512.h
+		openssl1.1 dhparam -5 -C -noout 512 > dh512.h
 
 dh@C_DH_LEN@.h:
-		openssl dhparam -5 -C -noout @C_DH_LEN@ > dh@C_DH_LEN@.h
+		openssl1.1 dhparam -5 -C -noout @C_DH_LEN@ > dh@C_DH_LEN@.h
 
 svc.o:		svc.c dh512.h dh@C_DH_LEN@.h
 		${CC} ${CFLAGS} -c -o svc.o svc.c