diff --git a/src/core/InterleavedBufferAttribute.js b/src/core/InterleavedBufferAttribute.js
index ebab87513781a6..07760bacb8aee3 100644
--- a/src/core/InterleavedBufferAttribute.js
+++ b/src/core/InterleavedBufferAttribute.js
@@ -13,7 +13,7 @@ class InterleavedBufferAttribute {
 		this.itemSize = itemSize;
 		this.offset = offset;
 
-		this.normalized = normalized;
+		this.normalized = normalized === true;
 
 	}
 
diff --git a/src/math/Euler.js b/src/math/Euler.js
index 0ff9938221f91d..74c93a8a0fc26a 100644
--- a/src/math/Euler.js
+++ b/src/math/Euler.js
@@ -228,7 +228,7 @@ class Euler {
 
 		this._order = order;
 
-		if ( update ) this._onChangeCallback();
+		if ( update === true ) this._onChangeCallback();
 
 		return this;