diff --git a/cmdgen.c b/cmdgen.c
index 6d8b39ac..50f99f70 100644
--- a/cmdgen.c
+++ b/cmdgen.c
@@ -257,7 +257,7 @@ static char *blobfp(char *alg, int bits, unsigned char *blob, int bloblen)
 int main(int argc, char **argv)
 {
     char *infile = NULL;
-    Filename *infilename, *outfilename;
+    Filename *infilename = NULL, *outfilename = NULL;
     enum { NOKEYGEN, RSA1, RSA2, DSA } keytype = NOKEYGEN;    
     char *outfile = NULL, *outfiletmp = NULL;
     enum { PRIVATE, PUBLIC, PUBLICO, FP, OPENSSH, SSHCOM } outtype = PRIVATE;