diff --git a/core/reactor_common.c b/core/reactor_common.c
index 9fd04e356..d97b0a84d 100644
--- a/core/reactor_common.c
+++ b/core/reactor_common.c
@@ -153,25 +153,27 @@ const char* lf_reactor_full_name(self_base_t* self) {
   if (self->full_name != NULL) {
     return self->full_name;
   }
-  // First find the length of the name.
-  size_t len = 0;
-  len += strlen(self->name);
+  // First find the length of the full name.
+  size_t name_len = strlen(self->name);
+  size_t len = name_len;
   self_base_t* parent = self->parent;
   while (parent != NULL) {
-    len++;
+    len++; // For the dot.
     len += strlen(parent->name);
     parent = parent->parent;
   }
   self->full_name = (char*)lf_allocate(len + 1, sizeof(char), &self->allocations);
+  self->full_name[len] = '\0'; // Null terminate the string.
 
-  size_t location = len - strlen(self->name);
-  strncpy(&self->full_name[location], self->name, strlen(self->name) + 1);
+  size_t location = len - name_len;
+  memcpy(&self->full_name[location], self->name, name_len);
   parent = self->parent;
   while (parent != NULL) {
     location--;
     self->full_name[location] = '.';
-    location -= strlen(parent->name);
-    strncpy(&self->full_name[location], parent->name, strlen(parent->name));
+    size_t parent_len = strlen(parent->name);
+    location -= parent_len;
+    memcpy(&self->full_name[location], parent->name, parent_len);
     parent = parent->parent;
   }
   return self->full_name;