diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec7dbfa06..fee2b8cc5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - program: add oracle id for wen ([#1129](https://github.com/drift-labs/protocol-v2/pull/1129))
 - program: track fuel ([#1048](https://github.com/drift-labs/protocol-v2/pull/1048))
+- program: validate fee structure ([#1075](https://github.com/drift-labs/protocol-v2/pull/1075))
 
 ### Fixes
 
diff --git a/programs/drift/src/validation/fee_structure.rs b/programs/drift/src/validation/fee_structure.rs
index d84bb345a..b07c78dba 100644
--- a/programs/drift/src/validation/fee_structure.rs
+++ b/programs/drift/src/validation/fee_structure.rs
@@ -31,7 +31,7 @@ pub fn validate_fee_structure(fee_structure: &FeeStructure) -> DriftResult {
     )?;
 
     validate!(
-        fee_structure.flat_filler_fee <= OPEN_ORDER_MARGIN_REQUIREMENT as u64,
+        fee_structure.flat_filler_fee < OPEN_ORDER_MARGIN_REQUIREMENT as u64 / 2,
         ErrorCode::InvalidFeeStructure,
         "invalid flat filler fee {}",
         fee_structure.flat_filler_fee