diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index cb9c801..0712f4e 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -300,7 +300,7 @@
     /* Size for postfix representation of expr. */
     postfix_size = sizeof(int) * nstate_max;
 
-    post_start = (int *)alloc(postfix_size);
+    post_start = alloc(postfix_size);
     if (post_start == NULL)
 	return FAIL;
     post_ptr = post_start;
@@ -516,7 +516,7 @@
     // For weird patterns the number of states can be very high. Increasing by
     // 50% seems a reasonable compromise between memory use and speed.
     new_max = nstate_max * 3 / 2;
-    new_start = (int *)alloc(new_max * sizeof(int));
+    new_start = ALLOC_MULT(int, new_max);
     if (new_start == NULL)
 	return FAIL;
     mch_memmove(new_start, post_start, nstate_max * sizeof(int));
@@ -3214,7 +3214,7 @@
     if (nfa_calc_size == FALSE)
     {
 	// Allocate space for the stack. Max states on the stack: "nstate'.
-	stack = (Frag_T *)alloc((nstate + 1) * sizeof(Frag_T));
+	stack = ALLOC_MULT(Frag_T, nstate + 1);
 	if (stack == NULL)
 	    return NULL;
 	stackp = stack;
@@ -4799,7 +4799,7 @@
 		emsg(_(e_maxmempat));
 		return NULL;
 	    }
-	    newl = (nfa_thread_T *)alloc(newsize);
+	    newl = alloc(newsize);
 	    if (newl == NULL)
 		return NULL;
 	    l->len = newlen;
@@ -5184,7 +5184,7 @@
 	if (*listids == NULL || *listids_len < prog->nstate)
 	{
 	    vim_free(*listids);
-	    *listids = (int *)alloc(sizeof(int) * prog->nstate);
+	    *listids = ALLOC_MULT(int, prog->nstate);
 	    if (*listids == NULL)
 	    {
 		emsg(_("E878: (NFA) Could not allocate memory for branch traversal!"));
@@ -5567,9 +5567,9 @@
     /* Allocate memory for the lists of nodes. */
     size = (prog->nstate + 1) * sizeof(nfa_thread_T);
 
-    list[0].t = (nfa_thread_T *)alloc(size);
+    list[0].t = alloc(size);
     list[0].len = prog->nstate + 1;
-    list[1].t = (nfa_thread_T *)alloc(size);
+    list[1].t = alloc(size);
     list[1].len = prog->nstate + 1;
     if (list[0].t == NULL || list[1].t == NULL)
 	goto theend;
@@ -7276,7 +7276,7 @@
 
     /* allocate the regprog with space for the compiled regexp */
     prog_size = sizeof(nfa_regprog_T) + sizeof(nfa_state_T) * (nstate - 1);
-    prog = (nfa_regprog_T *)alloc(prog_size);
+    prog = alloc(prog_size);
     if (prog == NULL)
 	goto fail;
     state_ptr = prog->state;