diff --git a/include/hashmap.h b/include/hashmap.h
index fddb0eae..f81664f0 100644
--- a/include/hashmap.h
+++ b/include/hashmap.h
@@ -33,6 +33,16 @@ typedef struct HashMapEntry *HashMap[HASHMAP_NB_BUCKETS];
  */
 bool hash_AddElement(HashMap map, char const *key, void *element);
 
+/**
+ * Replaces an element with an already-present key in a hashmap.
+ * @warning Inserting a NULL will make `hash_GetElement`'s return ambiguous!
+ * @param map The HashMap to replace the element in
+ * @param key The key with which the element will be stored and retrieved
+ * @param element The element to replace
+ * @return True if the element was found and replaced
+ */
+bool hash_ReplaceElement(HashMap const map, char const *key, void *element);
+
 /**
  * Removes an element from a hashmap.
  * @param map The HashMap to remove the element from
diff --git a/src/asm/charmap.c b/src/asm/charmap.c
index c8cfca72..eaddc3e0 100644
--- a/src/asm/charmap.c
+++ b/src/asm/charmap.c
@@ -173,6 +173,7 @@ void charmap_Add(char *mapping, uint8_t value)
 			if (currentCharmap->usedNodes == currentCharmap->capacity) {
 				currentCharmap->capacity *= 2;
 				currentCharmap = resizeCharmap(currentCharmap, currentCharmap->capacity);
+				hash_ReplaceElement(charmaps, currentCharmap->name, currentCharmap);
 			}
 
 			/* Switch to and init new node */
diff --git a/src/hashmap.c b/src/hashmap.c
index 76299396..a45cd449 100644
--- a/src/hashmap.c
+++ b/src/hashmap.c
@@ -64,6 +64,22 @@ bool hash_AddElement(HashMap map, char const *key, void *element)
 	return newEntry->next != NULL;
 }
 
+bool hash_ReplaceElement(HashMap const map, char const *key, void *element)
+{
+	HashType hashedKey = hash(key);
+	struct HashMapEntry *ptr = map[(HalfHashType)hashedKey];
+
+	while (ptr) {
+		if (hashedKey >> HALF_HASH_NB_BITS == ptr->hash
+		 && !strcmp(ptr->key, key)) {
+			ptr->content = element;
+			return true;
+		}
+		ptr = ptr->next;
+	}
+	return false;
+}
+
 bool hash_RemoveElement(HashMap map, char const *key)
 {
 	HashType hashedKey = hash(key);
diff --git a/test/asm/charmap-inheritance.asm b/test/asm/charmap-inheritance.asm
new file mode 100644
index 00000000..eab9c12f
--- /dev/null
+++ b/test/asm/charmap-inheritance.asm
@@ -0,0 +1,23 @@
+SECTION "test", ROM0
+
+	newcharmap foo
+
+	charmap "<START>",  $00
+	charmap "<RAM>",    $01
+	charmap "<WAIT>",   $02
+	charmap "<ASM>",    $03
+	charmap "<NUM>",    $04
+	charmap "<EXIT>",   $05
+	charmap "<SOUND>",  $06
+	charmap "<DAY>",    $07
+	charmap "<FAR>",    $08
+
+	; At this point, enough nodes were allocated for 'foo' to be reallocated.
+	; Its value in the charmaps' hashmap should have been updated too,
+	; so that usages of 'foo' will not segfault.
+
+	; This uses 'foo; by switching to it.
+	setcharmap foo
+
+	; This uses 'foo' by deriving another charmap from it.
+	newcharmap bar, foo
diff --git a/test/asm/charmap-inheritance.err b/test/asm/charmap-inheritance.err
new file mode 100644
index 00000000..e69de29b
diff --git a/test/asm/charmap-inheritance.out b/test/asm/charmap-inheritance.out
new file mode 100644
index 00000000..e69de29b