diff --git a/common/env_callback.c b/common/env_callback.c
index f4d3dbd77f..1957cc1996 100644
--- a/common/env_callback.c
+++ b/common/env_callback.c
@@ -97,6 +97,7 @@ static int set_callback(const char *name, const char *value, void *priv)
 
 	e.key	= name;
 	e.data	= NULL;
+	e.callback = NULL;
 	hsearch_r(e, FIND, &ep, &env_htab, 0);
 
 	/* does the env variable actually exist? */
diff --git a/common/env_flags.c b/common/env_flags.c
index e682d85178..771935508c 100644
--- a/common/env_flags.c
+++ b/common/env_flags.c
@@ -455,6 +455,7 @@ static int set_flags(const char *name, const char *value, void *priv)
 
 	e.key	= name;
 	e.data	= NULL;
+	e.callback = NULL;
 	hsearch_r(e, FIND, &ep, &env_htab, 0);
 
 	/* does the env variable actually exist? */