ECPG bug: PRAPARE FOR

I have code:

void main()
{
  char *foo = "CALL "My_Proc"(?)";
  EXEC SQL char *stmt = foo;
  EXEC SQL PREPARE prep_stmt FROM :stmt;

  EXEC SQL char *stmt2 = "CALL \x22OMy_Proc\x22(?)";
  EXEC SQL PREPARE prep_stmt2 FROM :stmt2;

  EXEC SQL PREPARE prep_stmt3 FROM "CALL "My_Proc"(?)";
}

ecpg sample.pgc -o sample.c