diff --git a/tests/ColorToBinary.cpp b/tests/ColorToBinary.cpp
index 3fc924f6..6e50cf13 100644
--- a/tests/ColorToBinary.cpp
+++ b/tests/ColorToBinary.cpp
@@ -241,7 +241,7 @@ int main(int argc, char **argv)
 
 	FILE *OUTFILE;
 	OUTFILE = fopen("ID.dat","wb");
-	fwrite(Dm.id,1,Nx*Ny*Nz,OUTFILE);
+	fwrite(PhaseID,1,Nx*Ny*Nz,OUTFILE);
 	fclose(OUTFILE);
 
 	OUTFILE = fopen("Phase.dat","wb");