diff --git a/src/property.ts b/src/property.ts
index 4b58cfc..12a3796 100644
--- a/src/property.ts
+++ b/src/property.ts
@@ -58,7 +58,7 @@ export class SimpleProperty implements Property {
         } else {
             // Structure
             const structure = getStructure(this.#type);
-            return structure.getSize();
+            return structure.getSize(true);
         }
     }
 
diff --git a/src/struct.ts b/src/struct.ts
index ff2cc92..55a319b 100644
--- a/src/struct.ts
+++ b/src/struct.ts
@@ -48,7 +48,7 @@ export class Struct {
         const alignment = this.getAlignment();
         return Math.ceil(size / alignment) * alignment;
     }
-    getSize() {
+    getSize(round: boolean) {
         let size;
         if (this.#size !== null) {
             size = this.#size;
@@ -61,7 +61,9 @@ export class Struct {
                 }
             }
         }
-        size = this.#roundSize(size);
+        if (round) {
+            size = this.#roundSize(size);
+        }
         return size;
     }
     getName() {
@@ -120,7 +122,7 @@ export class Struct {
         this.#properties.sort((a, b) => a.propertyOffset() - b.propertyOffset());
 
         // Check Size
-        const size = this.getSize();
+        const size = this.getSize(true);
         if (this.#size !== null) {
             // Check Alignment
             if (size !== this.#size) {
@@ -188,7 +190,7 @@ export class Struct {
             } else if (i === this.#properties.length) {
                 // End Of Structure Padding
                 if (this.#size !== null && lastProperty) {
-                    const realSize = lastProperty.propertyOffset() + lastProperty.propertySize();
+                    const realSize = this.#roundSize(lastProperty.propertyOffset() + lastProperty.propertySize());
                     neededPadding = this.#size - realSize;
                 }
             } else {
@@ -229,7 +231,7 @@ export class Struct {
         }
 
         // Sanity Check Size
-        const size = this.getSize();
+        const size = this.getSize(true);
         const isSizeDefined = this.#size !== null;
         out += assertSize(this.#name, size, isSizeDefined);