diff --git a/tools/cleanmap.cpp b/tools/cleanmap.cpp
index e9a5b8e5a..a85432d5f 100644
--- a/tools/cleanmap.cpp
+++ b/tools/cleanmap.cpp
@@ -60,7 +60,7 @@ int main (void)
                     for(uint32_t i = 0; i < splatter.size(); i++)
                     {
                         DFHack::t_spattervein & vein = splatter[i];
-                        if(vein.mat1 > 19)
+                        if(vein.mat1 != 0xC)
                         {
                             uint32_t addr = vein.address_of;
                             uint32_t offset = offsetof(DFHack::t_spattervein, intensity);