diff --git a/m-bitset.h b/m-bitset.h
index 2e979471..eed81356 100644
--- a/m-bitset.h
+++ b/m-bitset.h
@@ -40,7 +40,7 @@ typedef struct bitset_s {
   bitset_limb *ptr;       // Pointer to the allocated limbs
 } bitset_t[1];
 typedef struct bitset_s *bitset_ptr;
-typedef const struct bitset_s bitset_srcptr;
+typedef const struct bitset_s *bitset_srcptr;
 
 typedef struct bitset_it_s {
   size_t index;           // index to the array of bit
diff --git a/m-string.h b/m-string.h
index 8d4b9329..e961ae94 100644
--- a/m-string.h
+++ b/m-string.h
@@ -74,7 +74,7 @@ typedef struct string_s {
   char *ptr;
 } string_t[1];
 typedef struct string_s *string_ptr;
-typedef const struct string_s string_srcptr;
+typedef const struct string_s *string_srcptr;
 
 /* Input option for the fgets function */
 typedef enum string_fgets_s {