diff --git a/import.c b/import.c
index 25012d28..2e2c12fb 100644
--- a/import.c
+++ b/import.c
@@ -766,6 +766,7 @@ int openssh_write(const Filename *filename, struct ssh2_userkey *key,
         footer = "-----END DSA PRIVATE KEY-----\n";
     } else {
         assert(0);                     /* zoinks! */
+	exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
     }
 
     /*
@@ -1497,6 +1498,7 @@ int sshcom_write(const Filename *filename, struct ssh2_userkey *key,
 	type = "dl-modp{sign{dsa-nist-sha1},dh{plain}}";
     } else {
         assert(0);                     /* zoinks! */
+	exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
     }
 
     /*
diff --git a/unix/uxnet.c b/unix/uxnet.c
index 46959e2f..31b12921 100644
--- a/unix/uxnet.c
+++ b/unix/uxnet.c
@@ -576,6 +576,7 @@ static int try_connect(Actual_Socket sock)
 
       default:
 	assert(0 && "unknown address family");
+	exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
     }
 
     fl = fcntl(s, F_GETFL);