diff --git a/gl-natives/src/main/c/jaggl.c b/gl-natives/src/main/c/jaggl.c
index bd66976504..69c195a3ee 100644
--- a/gl-natives/src/main/c/jaggl.c
+++ b/gl-natives/src/main/c/jaggl.c
@@ -49,6 +49,7 @@
 		obj ## _carray = (*env)->GetPrimitiveArrayCritical(env, obj, NULL); \
 		obj ## _ptr = (void *) ((uintptr_t) obj ## _carray + (size_t) obj_off); \
 	} else { \
+		obj ## _carray = NULL; \
 		obj ## _ptr = NULL; \
 	}
 
@@ -655,7 +656,6 @@ JNIEXPORT jboolean JNICALL Java_jaggl_context_choosePixelFormat1(JNIEnv *env, jc
 				attribs[j++] = num_samples;
 			}
 
-			int format;
 			UINT num_formats;
 			if (!jaggl_wglChoosePixelFormatARB(jaggl_device, attribs, NULL, 1, &format, &num_formats)) {
 				continue;
@@ -686,7 +686,7 @@ JNIEXPORT jboolean JNICALL Java_jaggl_context_choosePixelFormat1(JNIEnv *env, jc
 		.cRedBits = 8,
 		.cGreenBits = 8,
 		.cBlueBits = 8,
-		.cAlphaBits = alpha_bits,
+		.cAlphaBits = (BYTE) alpha_bits,
 		.cDepthBits = 24,
 		.iLayerType = PFD_MAIN_PLANE
 	};
diff --git a/pom.xml b/pom.xml
index 8c560c92ca..712167c458 100644
--- a/pom.xml
+++ b/pom.xml
@@ -320,6 +320,35 @@
       <modules>
         <module>misc-natives</module>
       </modules>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>com.github.maven-nar</groupId>
+            <artifactId>nar-maven-plugin</artifactId>
+            <configuration>
+              <c>
+                <options>
+                  <option>/Wall</option>
+                  <!-- unused parameter -->
+                  <option>/wd4100</option>
+                  <!-- non-standard extension: nameless struct/union (in jawt_md.h) -->
+                  <option>/wd4201</option>
+                  <!-- non-standard extension: non-constant aggregate initializer -->
+                  <option>/wd4204</option>
+                  <!-- no function prototype given (in winuser.h) -->
+                  <option>/wd4255</option>
+                  <!-- undefined processor macro (in vcruntime.h and winioctl.h) -->
+                  <option>/wd4668</option>
+                  <!-- padding after data member (in jawt.h and jni.h) -->
+                  <option>/wd4820</option>
+                  <!-- compiler will insert Spectre mitigation -->
+                  <option>/wd5045</option>
+                </options>
+              </c>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
     </profile>
   </profiles>
 </project>