diff --git a/docs/src/developing/clients/jsonrpc-api.md b/docs/src/developing/clients/jsonrpc-api.md
index dd105e9fce..2192f73928 100644
--- a/docs/src/developing/clients/jsonrpc-api.md
+++ b/docs/src/developing/clients/jsonrpc-api.md
@@ -1277,7 +1277,7 @@ The result field will be a JSON object with the following fields:
 - `total: <f64>`, total inflation
 - `validator: <f64>`, inflation allocated to validators
 - `foundation: <f64>`, inflation allocated to the foundation
-- `epoch: <f64>`, epoch for which these values are valid
+- `epoch: <u64>`, epoch for which these values are valid
 
 #### Example: