diff --git a/src/devices/sound/saa1099.h b/src/devices/sound/saa1099.h
index 1452bdcb93c..c6b7382e38e 100644
--- a/src/devices/sound/saa1099.h
+++ b/src/devices/sound/saa1099.h
@@ -54,12 +54,15 @@ private:
 
 	struct saa1099_noise
 	{
-		saa1099_noise() { }
+		saa1099_noise() { (void)pad; }
 
 		/* vars to simulate the noise generator output */
 		double counter = 0.0;
 		double freq = 0.0;
 		u32 level = 0xffffffffU;    // noise polynomial shifter
+
+	private:
+		u32 pad; // pad out structure to multiple of sizeof(double)
 	};
 
 	void envelope_w(int ch);