diff --git a/src/mess/machine/c1541.c b/src/mess/machine/c1541.c
index 5985b72c34b..a1588ee014c 100644
--- a/src/mess/machine/c1541.c
+++ b/src/mess/machine/c1541.c
@@ -148,7 +148,8 @@
 #define M6502_TAG		"ucd5"
 #define M6522_0_TAG		"uab1"
 #define M6522_1_TAG		"ucd4"
-#define C64H156_TAG		"64h156"
+#define C64H156_TAG		"uc4"
+#define C64H157_TAG     "uc5"
 
 #define MC6821_TAG      "pia"
 #define CENTRONICS_TAG  "centronics"
diff --git a/src/mess/machine/c1571.c b/src/mess/machine/c1571.c
index d11994540ad..6d7b8376091 100644
--- a/src/mess/machine/c1571.c
+++ b/src/mess/machine/c1571.c
@@ -32,6 +32,7 @@
 #define M6526_TAG		"u20"
 #define WD1770_TAG		"u11"
 #define C64H156_TAG		"u6"
+#define C64H157_TAG		"u5"
 
 
 enum