diff --git a/src/glcontext_wgl.cpp b/src/glcontext_wgl.cpp
index 88d87ac9..ce841509 100644
--- a/src/glcontext_wgl.cpp
+++ b/src/glcontext_wgl.cpp
@@ -43,7 +43,7 @@ namespace bgfx
 		{
 			wglMakeCurrent(m_hdc, m_context);
 			GLenum err = glGetError();
-			BX_WARN(0 == err, "wglMakeCurrent failed with GL error: 0x%04x.", err);
+			BX_WARN(0 == err, "wglMakeCurrent failed with GL error: 0x%04x.", err); BX_UNUSED(err);
 		}
 
 		void swapBuffers()
@@ -322,7 +322,7 @@ namespace bgfx
 		{
 			wglMakeCurrent(m_hdc, m_context);
 			GLenum err = glGetError();
-			BX_WARN(0 == err, "wglMakeCurrent failed with GL error: 0x%04x.", err);
+			BX_WARN(0 == err, "wglMakeCurrent failed with GL error: 0x%04x.", err); BX_UNUSED(err);
 		}
 		else
 		{
diff --git a/src/renderer_d3d11.cpp b/src/renderer_d3d11.cpp
index cddbf0a6..9344d9bd 100644
--- a/src/renderer_d3d11.cpp
+++ b/src/renderer_d3d11.cpp
@@ -2957,7 +2957,7 @@ RENDERDOC_IMPORT
 
 			for (uint32_t eye = 0; eye < 2; ++eye)
 			{
-				const HMD::Eye hmdEye = hmd.eye[eye];
+				const HMD::Eye& hmdEye = hmd.eye[eye];
 				viewAdjust.un.val[12] = hmdEye.adjust[0];
 				viewAdjust.un.val[13] = hmdEye.adjust[1];
 				viewAdjust.un.val[14] = hmdEye.adjust[2];
diff --git a/src/renderer_gl.cpp b/src/renderer_gl.cpp
index c424cad1..a218a2a1 100644
--- a/src/renderer_gl.cpp
+++ b/src/renderer_gl.cpp
@@ -4126,7 +4126,7 @@ namespace bgfx
 
 			for (uint32_t eye = 0; eye < 2; ++eye)
 			{
-				const HMD::Eye hmdEye = hmd.eye[eye];
+				const HMD::Eye& hmdEye = hmd.eye[eye];
 				viewAdjust.un.val[12] = hmdEye.adjust[0];
 				viewAdjust.un.val[13] = hmdEye.adjust[1];
 				viewAdjust.un.val[14] = hmdEye.adjust[2];