diff --git a/doc/lightning-invoice.7.md b/doc/lightning-invoice.7.md
index b52ed45b4ded..aab55ad72f31 100644
--- a/doc/lightning-invoice.7.md
+++ b/doc/lightning-invoice.7.md
@@ -33,10 +33,8 @@ viewable by any node you send this invoice to (unless *deschashonly* is
 true as described below). It must be UTF-8, and cannot use *\\u* JSON 
 escape codes.
 
-The *expiry* is optionally the time the invoice is valid for; without a
-suffix it is interpreted as seconds, otherwise suffixes *s*, *m*, *h*,
-*d*, *w* indicate seconds, minutes, hours, days and weeks respectively.
-If no value is provided the default of 604800 (1w) is used.
+The *expiry* is optionally the time the invoice is valid for, in seconds.
+If no value is provided the default of 604800 (1 week) is used.
 
 The *fallbacks* array is one or more fallback addresses to include in
 the invoice (in order from most-preferred to least): note that these
diff --git a/lightningd/invoice.c b/lightningd/invoice.c
index 1c95e48d4abb..e68fb92208f7 100644
--- a/lightningd/invoice.c
+++ b/lightningd/invoice.c
@@ -1035,6 +1035,9 @@ static struct command_result *param_time(struct command *cmd, const char *name,
 		{ 'd', 24*60*60 },
 		{ 'w', 7*24*60*60 } };
 
+	if (!deprecated_apis)
+		return param_u64(cmd, name, buffer, tok, secs);
+
 	mul = 1;
 	if (timetok.end == timetok.start)
 		s = '\0';
@@ -1059,7 +1062,7 @@ static struct command_result *param_time(struct command *cmd, const char *name,
 	}
 
 	return command_fail_badparam(cmd, name, buffer, tok,
-				     "should be a number with optional {s,m,h,d,w} suffix");
+				     "should be a number");
 }
 
 static struct command_result *param_chanhints(struct command *cmd,
diff --git a/tests/test_invoices.py b/tests/test_invoices.py
index e02dd2561926..8052a2e06074 100644
--- a/tests/test_invoices.py
+++ b/tests/test_invoices.py
@@ -437,37 +437,12 @@ def test_invoice_expiry(node_factory, executor):
     # all invoices are expired and should be deleted
     assert len(l2.rpc.listinvoices()['invoices']) == 0
 
-    # Test expiry suffixes.
     start = int(time.time())
-    inv = l2.rpc.invoice(msatoshi=123000, label='inv_s', description='description', expiry='1s')['bolt11']
+    inv = l2.rpc.invoice(msatoshi=123000, label='inv_s', description='description', expiry=1)['bolt11']
     end = int(time.time())
     expiry = only_one(l2.rpc.listinvoices('inv_s')['invoices'])['expires_at']
     assert expiry >= start + 1 and expiry <= end + 1
 
-    start = int(time.time())
-    inv = l2.rpc.invoice(msatoshi=123000, label='inv_m', description='description', expiry='1m')['bolt11']
-    end = int(time.time())
-    expiry = only_one(l2.rpc.listinvoices('inv_m')['invoices'])['expires_at']
-    assert expiry >= start + 60 and expiry <= end + 60
-
-    start = int(time.time())
-    inv = l2.rpc.invoice(msatoshi=123000, label='inv_h', description='description', expiry='1h')['bolt11']
-    end = int(time.time())
-    expiry = only_one(l2.rpc.listinvoices('inv_h')['invoices'])['expires_at']
-    assert expiry >= start + 3600 and expiry <= end + 3600
-
-    start = int(time.time())
-    inv = l2.rpc.invoice(msatoshi=123000, label='inv_d', description='description', expiry='1d')['bolt11']
-    end = int(time.time())
-    expiry = only_one(l2.rpc.listinvoices('inv_d')['invoices'])['expires_at']
-    assert expiry >= start + 24 * 3600 and expiry <= end + 24 * 3600
-
-    start = int(time.time())
-    inv = l2.rpc.invoice(msatoshi=123000, label='inv_w', description='description', expiry='1w')['bolt11']
-    end = int(time.time())
-    expiry = only_one(l2.rpc.listinvoices('inv_w')['invoices'])['expires_at']
-    assert expiry >= start + 7 * 24 * 3600 and expiry <= end + 7 * 24 * 3600
-
 
 @pytest.mark.developer("Too slow without --dev-fast-gossip")
 def test_waitinvoice(node_factory, executor):