diff --git a/contrib/msggen/msggen/grpc.py b/contrib/msggen/msggen/grpc.py
index 735b92ac3..9b86ac931 100644
--- a/contrib/msggen/msggen/grpc.py
+++ b/contrib/msggen/msggen/grpc.py
@@ -12,7 +12,7 @@ typemap = {
     'msat': 'Amount',
     'msat_or_all': 'AmountOrAll',
     'msat_or_any': 'AmountOrAny',
-    'number': 'sint64',
+    'number': 'double',
     'pubkey': 'bytes',
     'short_channel_id': 'string',
     'signature': 'bytes',
diff --git a/contrib/msggen/msggen/rust.py b/contrib/msggen/msggen/rust.py
index d0b99d361..7803e2322 100644
--- a/contrib/msggen/msggen/rust.py
+++ b/contrib/msggen/msggen/rust.py
@@ -35,7 +35,7 @@ typemap = {
     'msat': 'Amount',
     'msat_or_all': 'AmountOrAll',
     'msat_or_any': 'AmountOrAny',
-    'number': 'i64',
+    'number': 'f64',
     'pubkey': 'Pubkey',
     'short_channel_id': 'ShortChannelId',
     'signature': 'String',