src/nnn.c | 5 +++--

diff --git a/src/nnn.c b/src/nnn.c
index e822a4c2eab1cf9fce8fe3630ed54de47e3ff25e..e2b02b2747b855b0e6e221ce423b3fb82e2b58be 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -6377,11 +6377,12 @@ 			switch (sel) {
 			case SEL_SHELL:
 				/* Set nnn nesting level */
 				tmp = getenv(env_cfg[NNNLVL]);
-				setenv(env_cfg[NNNLVL], xitoa((tmp ? atoi(tmp) : 0) + 1), 1);
+				r = tmp ? atoi(tmp) : 0;
+				setenv(env_cfg[NNNLVL], xitoa(r + 1), 1);
 
 				setenv(envs[ENV_NCUR], (ndents ? dents[cur].name : ""), 1);
 				spawn(shell, NULL, NULL, F_CLI);
-				setenv(env_cfg[NNNLVL], xitoa(tmp ? atoi(tmp) : 0), 1);
+				setenv(env_cfg[NNNLVL], xitoa(r), 1);
 				r = TRUE;
 				break;
 			case SEL_LAUNCH: