diff --git a/src/java/org/lwjgl/PointerBuffer.java b/src/java/org/lwjgl/PointerBuffer.java
index 7938d093..c1a02b9a 100644
--- a/src/java/org/lwjgl/PointerBuffer.java
+++ b/src/java/org/lwjgl/PointerBuffer.java
@@ -80,12 +80,8 @@ public class PointerBuffer implements Comparable {
 	 * @param source the source buffer
 	 */
 	public PointerBuffer(final ByteBuffer source) {
-		if ( !source.isDirect() )
-			throw new IllegalArgumentException("ByteBuffer is not direct");
-
-		final int alignment = is64Bit ? 8 : 4;
-		if ( (BufferUtils.getBufferAddress(source) + source.position()) % alignment != 0 || source.remaining() % alignment != 0 )
-			throw new IllegalArgumentException("The source buffer is not aligned to " + alignment + " bytes.");
+		if ( LWJGLUtil.CHECKS )
+			checkSource(source);
 
 		pointers = source.slice().order(source.order());
 
@@ -98,6 +94,15 @@ public class PointerBuffer implements Comparable {
 		}
 	}
 
+	private static void checkSource(final ByteBuffer source) {
+		if ( !source.isDirect() )
+			throw new IllegalArgumentException("The source buffer is not direct.");
+
+		final int alignment = is64Bit ? 8 : 4;
+		if ( (BufferUtils.getBufferAddress(source) + source.position()) % alignment != 0 || source.remaining() % alignment != 0 )
+			throw new IllegalArgumentException("The source buffer is not aligned to " + alignment + " bytes.");
+	}
+
 	/**
 	 * Returns the ByteBuffer that backs this PointerBuffer.
 	 *
diff --git a/src/native/common/org_lwjgl_BufferUtils.c b/src/native/common/org_lwjgl_BufferUtils.c
index cf7cd12e..be80123c 100644
--- a/src/native/common/org_lwjgl_BufferUtils.c
+++ b/src/native/common/org_lwjgl_BufferUtils.c
@@ -1,4 +1,5 @@
 #include "org_lwjgl_BufferUtils.h"
+#include "common_tools.h"
 
 JNIEXPORT void JNICALL Java_org_lwjgl_BufferUtils_zeroBuffer0(JNIEnv *env, jclass clazz, jobject buffer, jlong offset, jlong size) {
 	memset((char*)(*env)->GetDirectBufferAddress(env, buffer) + (size_t)offset, 0, (size_t)size);
@@ -6,4 +7,4 @@ JNIEXPORT void JNICALL Java_org_lwjgl_BufferUtils_zeroBuffer0(JNIEnv *env, jclas
 
 JNIEXPORT jlong JNICALL Java_org_lwjgl_BufferUtils_getBufferAddress(JNIEnv *env, jclass clazz, jobject buffer) {
     return (intptr_t)(*env)->GetDirectBufferAddress(env, buffer);
-}
\ No newline at end of file
+}