diff --git a/source/build/src/engine.cpp b/source/build/src/engine.cpp
index 9b1faaa1f..0daadfa45 100644
--- a/source/build/src/engine.cpp
+++ b/source/build/src/engine.cpp
@@ -159,7 +159,7 @@ int32_t globaltilesizy;
 int32_t globalx1, globaly2, globalx3, globaly3;
 
 int32_t sloptable[SLOPTABLESIZ];
-#define SLOPALOOKUPSIZ (MAXXDIM<<1)
+#define SLOPALOOKUPSIZ 16384
 static intptr_t slopalookup[SLOPALOOKUPSIZ];    // was 2048
 
 static int32_t no_radarang2 = 0;