diff --git a/certgen/Makefile b/certgen/Makefile
index 7a431c35..49f08126 100644
--- a/certgen/Makefile
+++ b/certgen/Makefile
@@ -13,7 +13,7 @@ CFLAGS=-I$(WOLF_INSTALL_DIR)/include -Wall
 LIBS=-L$(WOLF_INSTALL_DIR)/lib -lwolfssl
 
 
-all:certgen_example csr_example csr_w_ed25519_example csr_sign csr_cryptocb custom_ext_callback`
+all:certgen_example csr_example csr_w_ed25519_example csr_sign csr_cryptocb custom_ext custom_ext_callback
 
 certgen_example:certgen_example.o
 	$(CC) -o $@ $^ $(CFLAGS) $(CPPFLAGS) $(LIBS)
@@ -30,11 +30,14 @@ csr_sign:csr_sign.o
 csr_cryptocb:csr_cryptocb.o
 	$(CC) -o $@ $^ $(CFLAGS) $(CPPFLAGS) $(LIBS)
 
+custom_ext:custom_ext.o
+	$(CC) -o $@ $^ $(CFLAGS) $(CPPFLAGS) $(LIBS)
+
 custom_ext_callback:custom_ext_callback.o
 	$(CC) -o $@ $^ $(CFLAGS) $(CPPFLAGS) $(LIBS)
 
 .PHONY: clean all
 
 clean:
-	rm -f *.o certgen_example csr_example csr_w_ed25519_example csr_sign csr_cryptocb custom_ext_callback
+	rm -f *.o certgen_example csr_example csr_w_ed25519_example csr_sign csr_cryptocb custom_ext custom_ext_callback
 	rm -f newCert.*