diff --git a/src/avrdude.conf.in b/src/avrdude.conf.in
index 73f78feb..43a6efae 100644
--- a/src/avrdude.conf.in
+++ b/src/avrdude.conf.in
@@ -6233,6 +6233,11 @@ part parent "m324p" # m324pb
     memory "sigrow"
         alias "prodsig";
     ;
+
+    memory "sernum"
+        size               = 10;
+        offset             = 0xe; # Sub-region of prodsig
+    ;
 ;
 
 #------------------------------------------------------------
@@ -11036,6 +11041,11 @@ part parent "m328" # m328pb
     memory "sigrow"
         alias "prodsig";
     ;
+
+    memory "sernum"
+        size               = 10;
+        offset             = 0xe; # Sub-region of prodsig
+    ;
 ;
 
 #------------------------------------------------------------
@@ -20763,6 +20773,11 @@ part parent ".reduced_core_tiny" # t102
         alias "prodsig";
     ;
 
+    memory "sernum"
+        size               = 10;
+        offset             = 0x6; # Sub-region of prodsig
+    ;
+
     memory "io"
         size               = 64;
     ;
@@ -20806,6 +20821,11 @@ part parent ".reduced_core_tiny" # t104
         alias "prodsig";
     ;
 
+    memory "sernum"
+        size               = 10;
+        offset             = 0x6; # Sub-region of prodsig
+    ;
+
     memory "io"
         size               = 64;
     ;