diff --git a/usr.bin/grep/regex/tre-fastmatch.c b/usr.bin/grep/regex/tre-fastmatch.c
index bf59b9f8d551..6bf7c446529e 100644
--- a/usr.bin/grep/regex/tre-fastmatch.c
+++ b/usr.bin/grep/regex/tre-fastmatch.c
@@ -351,7 +351,7 @@ static int	fastcmp(const fastmatch_t *fg, const void *data,
 #define FILL_BMGS							\
   if (fg->len > 0 && !fg->hasdot)					\
     {									\
-      fg->sbmGs = malloc(fg->len * sizeof(int));			\
+      fg->sbmGs = malloc(fg->len * sizeof(*fg->sbmGs));			\
       if (!fg->sbmGs)							\
 	return REG_ESPACE;						\
       if (fg->len == 1)							\
@@ -367,7 +367,7 @@ static int	fastcmp(const fastmatch_t *fg, const void *data,
 #define FILL_BMGS_WIDE							\
   if (fg->wlen > 0 && !fg->hasdot)					\
     {									\
-      fg->bmGs = malloc(fg->wlen * sizeof(int));			\
+      fg->bmGs = malloc(fg->wlen * sizeof(*fg->bmGs));			\
       if (!fg->bmGs)							\
 	return REG_ESPACE;						\
       if (fg->wlen == 1)						\