diff --git a/builtin-ls-tree.c b/builtin-ls-tree.c
index 201defd934..6472610ac2 100644
--- a/builtin-ls-tree.c
+++ b/builtin-ls-tree.c
@@ -118,7 +118,7 @@ int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 				chomp_prefix = 0;
 				break;
 			}
-			if (!strncmp(argv[1]+2, "abbrev=",7)) {
+			if (!prefixcmp(argv[1]+2, "abbrev=")) {
 				abbrev = strtoul(argv[1]+9, NULL, 10);
 				if (abbrev && abbrev < MINIMUM_ABBREV)
 					abbrev = MINIMUM_ABBREV;
diff --git a/builtin-rev-parse.c b/builtin-rev-parse.c
index a1c3411121..37addb25fa 100644
--- a/builtin-rev-parse.c
+++ b/builtin-rev-parse.c
@@ -233,7 +233,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 			}
 			continue;
 		}
-		if (!strncmp(arg,"-n",2)) {
+		if (!prefixcmp(arg, "-n")) {
 			if ((filter & DO_FLAGS) && (filter & DO_REVS))
 				show(arg);
 			continue;
diff --git a/builtin-show-branch.c b/builtin-show-branch.c
index 402a8f7930..67ae6bacda 100644
--- a/builtin-show-branch.c
+++ b/builtin-show-branch.c
@@ -378,7 +378,7 @@ static int append_head_ref(const char *refname, const unsigned char *sha1, int f
 {
 	unsigned char tmp[20];
 	int ofs = 11;
-	if (strncmp(refname, "refs/heads/", ofs))
+	if (prefixcmp(refname, "refs/heads/"))
 		return 0;
 	/* If both heads/foo and tags/foo exists, get_sha1 would
 	 * get confused.
@@ -392,7 +392,7 @@ static int append_remote_ref(const char *refname, const unsigned char *sha1, int
 {
 	unsigned char tmp[20];
 	int ofs = 13;
-	if (strncmp(refname, "refs/remotes/", ofs))
+	if (prefixcmp(refname, "refs/remotes/"))
 		return 0;
 	/* If both heads/foo and tags/foo exists, get_sha1 would
 	 * get confused.
diff --git a/diff.c b/diff.c
index fad13ab44b..c3afee2743 100644
--- a/diff.c
+++ b/diff.c
@@ -77,7 +77,7 @@ int git_diff_ui_config(const char *var, const char *value)
 			diff_detect_rename_default = DIFF_DETECT_RENAME;
 		return 0;
 	}
-	if (!prefixcmp(var, "diff.color.") || !strncmp(var, "color.diff.", 11)) {
+	if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
 		int slot = parse_diff_color_slot(var, 11);
 		color_parse(value, var, diff_colors[slot]);
 		return 0;
diff --git a/http-fetch.c b/http-fetch.c
index d9a4561c8c..e6cd11db73 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -718,7 +718,7 @@ static int fetch_indices(struct alt_base *repo)
 			i++;
 			if (i + 52 <= buffer.posn &&
 			    !prefixcmp(data + i, " pack-") &&
-			    !strncmp(data + i + 46, ".pack\n", 6)) {
+			    !prefixcmp(data + i + 46, ".pack\n")) {
 				get_sha1_hex(data + i + 6, sha1);
 				setup_index(repo, sha1);
 				i += 51;
diff --git a/http-push.c b/http-push.c
index eb77c9af45..9ad6fd00b0 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1061,7 +1061,7 @@ static int fetch_indices(void)
 			i++;
 			if (i + 52 < buffer.posn &&
 			    !prefixcmp(data + i, " pack-") &&
-			    !strncmp(data + i + 46, ".pack\n", 6)) {
+			    !prefixcmp(data + i + 46, ".pack\n")) {
 				get_sha1_hex(data + i + 6, sha1);
 				setup_index(sha1);
 				i += 51;
diff --git a/imap-send.c b/imap-send.c
index 3eaf025720..84df2fabb7 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -1192,7 +1192,7 @@ count_messages( msg_data_t *msg )
 	char *p = msg->data;
 
 	while (1) {
-		if (!strncmp( "From ", p, 5 )) {
+		if (!prefixcmp(p, "From ")) {
 			count++;
 			p += 5;
 		}
@@ -1216,7 +1216,7 @@ split_msg( msg_data_t *all_msgs, msg_data_t *msg, int *ofs )
 	data = &all_msgs->data[ *ofs ];
 	msg->len = all_msgs->len - *ofs;
 
-	if (msg->len < 5 || strncmp( data, "From ", 5 ))
+	if (msg->len < 5 || prefixcmp(data, "From "))
 		return 0;
 
 	p = strchr( data, '\n' );
@@ -1267,12 +1267,12 @@ git_imap_config(const char *key, const char *val)
 		imap_folder = xstrdup( val );
 	} else if (!strcmp( "host", key )) {
 		{
-			if (!strncmp( "imap:", val, 5 ))
+			if (!prefixcmp(val, "imap:"))
 				val += 5;
 			if (!server.port)
 				server.port = 143;
 		}
-		if (!strncmp( "//", val, 2 ))
+		if (!prefixcmp(val, "//"))
 			val += 2;
 		server.host = xstrdup( val );
 	}
diff --git a/revision.c b/revision.c
index abab3b9d01..622afe3aa6 100644
--- a/revision.c
+++ b/revision.c
@@ -832,7 +832,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 				revs->max_count = atoi(argv[++i]);
 				continue;
 			}
-			if (!strncmp(arg,"-n",2)) {
+			if (!prefixcmp(arg, "-n")) {
 				revs->max_count = atoi(arg + 2);
 				continue;
 			}
diff --git a/wt-status.c b/wt-status.c
index d17a6ba5b2..035e546ed7 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -344,7 +344,7 @@ int git_status_config(const char *k, const char *v)
 		wt_status_use_color = git_config_colorbool(k, v);
 		return 0;
 	}
-	if (!prefixcmp(k, "status.color.") || !strncmp(k, "color.status.", 13)) {
+	if (!prefixcmp(k, "status.color.") || !prefixcmp(k, "color.status.")) {
 		int slot = parse_status_slot(k, 13);
 		color_parse(v, k, wt_status_colors[slot]);
 	}