diff --git a/backend/src/api/fee-api.ts b/backend/src/api/fee-api.ts
index 2ad9744d2..2cace75dd 100644
--- a/backend/src/api/fee-api.ts
+++ b/backend/src/api/fee-api.ts
@@ -34,7 +34,7 @@ class FeeApi {
     if (pBlock.blockVSize <= 500000) {
       return this.defaultFee;
     }
-    if (pBlock.blockVSize <= 950000 && nextBlock) {
+    if (pBlock.blockVSize <= 950000 && !nextBlock) {
       const multiplier = (pBlock.blockVSize - 500000) / 500000;
       return Math.max(Math.round(useFee * multiplier), this.defaultFee);
     }
diff --git a/frontend/src/app/components/fees-box/fees-box.component.ts b/frontend/src/app/components/fees-box/fees-box.component.ts
index 8823891f7..6af4d806f 100644
--- a/frontend/src/app/components/fees-box/fees-box.component.ts
+++ b/frontend/src/app/components/fees-box/fees-box.component.ts
@@ -58,7 +58,7 @@ export class FeesBoxComponent implements OnInit {
     if (pBlock.blockVSize <= 500000) {
       return this.defaultFee;
     }
-    if (pBlock.blockVSize <= 950000 && nextBlock) {
+    if (pBlock.blockVSize <= 950000 && !nextBlock) {
       const multiplier = (pBlock.blockVSize - 500000) / 500000;
       return Math.max(Math.round(useFee * multiplier), this.defaultFee);
     }