diff --git a/.flowconfig b/.flowconfig
index 0d79ddce53f..17f6b722c26 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -63,6 +63,7 @@ nonstrict-import=warn
 deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
+unused-promise=error
 
 [strict]
 deprecated-type
diff --git a/.flowconfig.android b/.flowconfig.android
index da1512b4b19..7999c90a7bc 100644
--- a/.flowconfig.android
+++ b/.flowconfig.android
@@ -63,6 +63,7 @@ nonstrict-import=warn
 deprecated-type=error
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
+unused-promise=error
 
 [strict]
 deprecated-type