diff --git a/src/tileatlasvx.cpp b/src/tileatlasvx.cpp
index 3da7b4a..09988f9 100644
--- a/src/tileatlasvx.cpp
+++ b/src/tileatlasvx.cpp
@@ -358,6 +358,7 @@ readAutotile(Reader &reader, int patternID,
              const StaticRect rectSource[], int rectSourceN)
 {
 	FloatRect tex[4], pos[4];
+	(void) rectSourceN;
 
 	for (int i = 0; i < 4; ++i)
 	{