diff --git a/src/common.ts b/src/common.ts
index a79439a..5f70dbd 100644
--- a/src/common.ts
+++ b/src/common.ts
@@ -134,7 +134,13 @@ export class Size {
         this.#pointerAligned = pointerAligned;
     }
 
+    has() {
+        return this.#size !== null;
+    }
     get() {
+        if (this.#size === null) {
+            throw new Error('No Size Specified');
+        }
         return this.#size;
     }
     set(size: number, isExact: boolean) {
diff --git a/src/struct.ts b/src/struct.ts
index b58db90..12d8b12 100644
--- a/src/struct.ts
+++ b/src/struct.ts
@@ -63,13 +63,15 @@ export class Struct {
         let size;
         if (this.#size.isExact()) {
             // Exact Size Is Specified
-            size = this.#size.get()!;
+            size = this.#size.get();
         } else {
             // Specified Size Is A Lower Bound
             size = this.#getRealSize();
-            const specifiedSize = this.#size.get();
-            if (specifiedSize !== null && specifiedSize > size) {
-                size = specifiedSize;
+            if (this.#size.has()) {
+                const specifiedSize = this.#size.get();
+                if (specifiedSize > size) {
+                    size = specifiedSize;
+                }
             }
         }
         if (round) {
diff --git a/src/vtable.ts b/src/vtable.ts
index 002b2a6..1c51458 100644
--- a/src/vtable.ts
+++ b/src/vtable.ts
@@ -69,8 +69,8 @@ export class VTable implements Property {
     // Check
     #check() {
         // Check Size
-        const size = this.#size.get();
-        if (size !== null) {
+        if (this.#size.has()) {
+            const size = this.#size.get();
             const maxMethodCount = size / POINTER_SIZE;
             if (this.#size.isExact() && maxMethodCount < this.#methods.length) {
                 throw new Error(`VTable Size Too Small: ${toHex(size)}`);
@@ -112,9 +112,8 @@ export class VTable implements Property {
         out += `};\n`;
 
         // Sanity Check Size
-        const rawSize = this.#size.get();
         const isSizeDefined = this.#size.isExact();
-        const size = isSizeDefined ? rawSize! : (this.#methods.length * POINTER_SIZE);
+        const size = isSizeDefined ? this.#size.get() : (this.#methods.length * POINTER_SIZE);
         out += assertSize(this.#getName(), size, isSizeDefined);
 
         // Pointers