diff --git a/tests/TestCommD3Q19.cpp b/tests/TestCommD3Q19.cpp
index c4f3b864..cdf2cdd6 100644
--- a/tests/TestCommD3Q19.cpp
+++ b/tests/TestCommD3Q19.cpp
@@ -272,11 +272,15 @@ int main(int argc, char **argv)
 	// Assign the phase ID field
 	//.......................................................................
 	if (rank==0) printf("Assigning phase ID from file \n");
+	char LocalRankString[8];
+	sprintf(LocalRankString,"%05d",rank);
+	char LocalRankFilename[40];
+	sprintf(LocalRankFilename,"ID.%05i",rank);
+	
 	char *id;
 	id = new char[Nx*Ny*Nz];
-	char LocalRankFilename[40];
+
 	if (rank==0) printf("Initialize from segmented data: solid=0, NWP=1, WP=2 \n");
-	sprintf(LocalRankFilename,"ID.%05i",rank);
 	FILE *IDFILE = fopen(LocalRankFilename,"rb");
 	if (IDFILE==NULL) ERROR("Error opening file: ID.xxxxx");
 	fread(id,1,N,IDFILE);