diff --git a/src/Makefile b/src/Makefile
index 895a7cb..92d2162 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -37,8 +37,7 @@ OMPFLAGS =
 # icc with OpenMP (for make target linux-x86-64-icc)
 #ICCOMPFLAGS = -openmp
 
-# NSS (and NSPR) flag
-HAVE_NSS =
+# NSS (and NSPR) flag, un-comment if installed (needed for mozilla format)
 #HAVE_NSS = -DHAVE_NSS
 
 CFLAGS = -c -Wall -O2 -fomit-frame-pointer -I/usr/local/include $(HAVE_NSS) $(OMPFLAGS) $(JOHN_CFLAGS) `pkg-config --cflags nss`
@@ -1405,8 +1404,10 @@ cuda_rawsha224_fmt.o: cuda_rawsha224.o cuda_rawsha256_fmt.c cuda_rawsha256.h
 	ln -s john ../run/rar2john
 
 ../run/mozilla2john: ../run/john
+ifdef HAVE_NSS
 	$(RM) ../run/mozilla2john
 	ln -s john ../run/mozilla2john
+endif
 
 ../run/racf2john: ../run/john
 	$(RM) ../run/racf2john
@@ -1443,7 +1444,9 @@ cuda_rawsha224_fmt.o: cuda_rawsha224.o cuda_rawsha256_fmt.c cuda_rawsha256.h
 	copy john.com ..\run\rar2john.com
 
 ../run/mozilla2john.com: john.com
+ifdef HAVE_NSS
 	copy john.com ..\run\mozilla2john.com
+endif
 
 ../run/racf2john.com: john.com
 	copy john.com ..\run\racf2john.com
@@ -1502,8 +1505,10 @@ john.com: john.asm
 	strip ../run/rar2john.exe
 
 ../run/mozilla2john.exe: symlink.c
+ifdef HAVE_NSS
 	$(CC) symlink.c -o ../run/mozilla2john.exe
 	strip ../run/mozilla2john.exe
+endif
 
 ../run/racf2john.exe: symlink.c
 	$(CC) symlink.c -o ../run/racf2john.exe