diff --git a/bus.cpp b/bus.cpp
index 93026c3..f44d9db 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -576,7 +576,7 @@ uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, c
 			}
 		}
 
-		DOLOG(debug, !peek_only, "virtual address %06o maps to physical address %08o (run_mode: %d, apf: %d, par: %08o, poff: %o, AC: %d)", a, m_offset, run_mode, apf, pages[run_mode][d][apf].par * 64, p_offset, pages[run_mode][d][apf].pdr & 7);
+		DOLOG(debug, !peek_only, "virtual address %06o maps to physical address %08o (run_mode: %d, apf: %d, par: %08o, poff: %o, AC: %d, %s)", a, m_offset, run_mode, apf, pages[run_mode][d][apf].par * 64, p_offset, pages[run_mode][d][apf].pdr & 7, d ? "D" : "I");
 	}
 
 	return m_offset;