diff --git a/src/common/wpa_common.h b/src/common/wpa_common.h
index 504ec2d..d42ac92 100644
--- a/src/common/wpa_common.h
+++ b/src/common/wpa_common.h
@@ -213,6 +213,7 @@
 	size_t kck_len;
 	size_t kek_len;
 	size_t tk_len;
+	int installed; /* 1 if key has already been installed to driver */
 };
 
 struct wpa_gtk {
diff --git a/src/rsn_supp/wpa.c b/src/rsn_supp/wpa.c
index 319620e..4176be6 100644
--- a/src/rsn_supp/wpa.c
+++ b/src/rsn_supp/wpa.c
@@ -489,7 +489,6 @@
 		os_memset(buf, 0, sizeof(buf));
 	}
 	sm->tptk_set = 1;
-	sm->tk_to_set = 1;
 
 	kde = sm->assoc_wpa_ie;
 	kde_len = sm->assoc_wpa_ie_len;
@@ -595,7 +594,7 @@
 	const u8 *key_rsc;
 	u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 
-	if (!sm->tk_to_set) {
+	if (sm->ptk.installed) {
 		wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
 			"WPA: Do not re-install same PTK to the driver");
 		return 0;
@@ -639,7 +638,7 @@
 
 	/* TK is not needed anymore in supplicant */
 	os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN);
-	sm->tk_to_set = 0;
+	sm->ptk.installed = 1;
 
 	if (sm->wpa_ptk_rekey) {
 		eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
diff --git a/src/rsn_supp/wpa_i.h b/src/rsn_supp/wpa_i.h
index ee21a8a..27b6123 100644
--- a/src/rsn_supp/wpa_i.h
+++ b/src/rsn_supp/wpa_i.h
@@ -24,7 +24,6 @@
 	struct wpa_ptk ptk, tptk;
 	int ptk_set, tptk_set;
 	unsigned int msg_3_of_4_ok:1;
-	unsigned int tk_to_set:1;
 	u8 snonce[WPA_NONCE_LEN];
 	u8 anonce[WPA_NONCE_LEN]; /* ANonce from the last 1/4 msg */
 	int renew_snonce;