diff --git a/builtin/checkout.c b/builtin/checkout.c
index b52c490..2cdc6cd 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -863,7 +863,7 @@
 		strbuf_addf(&msg, "checkout: moving from %s to %s",
 			old_desc ? old_desc : "(invalid)", new_branch_info->name);
 	else
-		strbuf_insert(&msg, 0, reflog_msg, strlen(reflog_msg));
+		strbuf_insertstr(&msg, 0, reflog_msg);
 
 	if (!strcmp(new_branch_info->name, "HEAD") && !new_branch_info->path && !opts->force_detach) {
 		/* Nothing to do. */
diff --git a/builtin/notes.c b/builtin/notes.c
index 95456f3..35e468e 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -622,7 +622,7 @@
 
 		strbuf_grow(&d.buf, size + 1);
 		if (d.buf.len && prev_buf && size)
-			strbuf_insert(&d.buf, 0, "\n", 1);
+			strbuf_insertstr(&d.buf, 0, "\n");
 		if (prev_buf && size)
 			strbuf_insert(&d.buf, 0, prev_buf, size);
 		free(prev_buf);
@@ -745,7 +745,7 @@
 	memset(&pretty_ctx, 0, sizeof(pretty_ctx));
 	format_commit_message(partial, "%s", &msg, &pretty_ctx);
 	strbuf_trim(&msg);
-	strbuf_insert(&msg, 0, "notes: ", 7);
+	strbuf_insertstr(&msg, 0, "notes: ");
 	update_ref(msg.buf, o->local_ref, &oid,
 		   is_null_oid(&parent_oid) ? NULL : &parent_oid,
 		   0, UPDATE_REFS_DIE_ON_ERR);
diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
index b3bed89..38d0d94 100644
--- a/builtin/sparse-checkout.c
+++ b/builtin/sparse-checkout.c
@@ -373,7 +373,7 @@
 		return;
 
 	if (line->buf[0] != '/')
-		strbuf_insert(line, 0, "/", 1);
+		strbuf_insertstr(line, 0, "/");
 
 	insert_recursive_pattern(pl, line);
 }
diff --git a/commit.c b/commit.c
index 434ec03..83e1190 100644
--- a/commit.c
+++ b/commit.c
@@ -993,7 +993,7 @@
 			strbuf_insert(buf, inspos, gpg_sig_header, gpg_sig_header_len);
 			inspos += gpg_sig_header_len;
 		}
-		strbuf_insert(buf, inspos++, " ", 1);
+		strbuf_insertstr(buf, inspos++, " ");
 		strbuf_insert(buf, inspos, bol, len);
 		inspos += len;
 		copypos += len;
diff --git a/config.c b/config.c
index d75f88c..b386c0c 100644
--- a/config.c
+++ b/config.c
@@ -204,7 +204,7 @@
 		strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 		prefix = slash - path.buf + 1 /* slash */;
 	} else if (!is_absolute_path(pat->buf))
-		strbuf_insert(pat, 0, "**/", 3);
+		strbuf_insertstr(pat, 0, "**/");
 
 	add_trailing_starstar_for_dir(pat);
 
diff --git a/http.c b/http.c
index 5f34816..00a0e50 100644
--- a/http.c
+++ b/http.c
@@ -680,8 +680,8 @@
 	for (header = headers; *header; header++) {
 		if (hide_sensitive_header)
 			redact_sensitive_header(*header);
-		strbuf_insert((*header), 0, text, strlen(text));
-		strbuf_insert((*header), strlen(text), ": ", 2);
+		strbuf_insertstr((*header), 0, text);
+		strbuf_insertstr((*header), strlen(text), ": ");
 		strbuf_rtrim((*header));
 		strbuf_addch((*header), '\n');
 		trace_strbuf(&trace_curl, (*header));
diff --git a/mailinfo.c b/mailinfo.c
index b395adb..543962d 100644
--- a/mailinfo.c
+++ b/mailinfo.c
@@ -254,7 +254,7 @@
 	mi->delsp = has_attr_value(line->buf, "delsp=", "yes");
 
 	if (slurp_attr(line->buf, "boundary=", boundary)) {
-		strbuf_insert(boundary, 0, "--", 2);
+		strbuf_insertstr(boundary, 0, "--");
 		if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
 			error("Too many boundaries to handle");
 			mi->input_error = -1;
@@ -570,7 +570,7 @@
 		len = strlen("Content-Type: ");
 		strbuf_add(&sb, line->buf + len, line->len - len);
 		decode_header(mi, &sb);
-		strbuf_insert(&sb, 0, "Content-Type: ", len);
+		strbuf_insertstr(&sb, 0, "Content-Type: ");
 		handle_content_type(mi, &sb);
 		ret = 1;
 		goto check_header_out;
diff --git a/notes-utils.c b/notes-utils.c
index a819410..4bf4888 100644
--- a/notes-utils.c
+++ b/notes-utils.c
@@ -52,7 +52,7 @@
 	strbuf_complete_line(&buf);
 
 	create_notes_commit(r, t, NULL, buf.buf, buf.len, &commit_oid);
-	strbuf_insert(&buf, 0, "notes: ", 7); /* commit message starts at index 7 */
+	strbuf_insertstr(&buf, 0, "notes: ");
 	update_ref(buf.buf, t->update_ref, &commit_oid, NULL, 0,
 		   UPDATE_REFS_DIE_ON_ERR);
 
diff --git a/notes.c b/notes.c
index 0c79964..a24af53 100644
--- a/notes.c
+++ b/notes.c
@@ -1332,9 +1332,9 @@
 	if (starts_with(sb->buf, "refs/notes/"))
 		return; /* we're happy */
 	else if (starts_with(sb->buf, "notes/"))
-		strbuf_insert(sb, 0, "refs/", 5);
+		strbuf_insertstr(sb, 0, "refs/");
 	else
-		strbuf_insert(sb, 0, "refs/notes/", 11);
+		strbuf_insertstr(sb, 0, "refs/notes/");
 }
 
 void expand_loose_notes_ref(struct strbuf *sb)
diff --git a/pretty.c b/pretty.c
index 305e903..1cd6e93 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1581,9 +1581,9 @@
 			strbuf_setlen(sb, sb->len - 1);
 	} else if (orig_len != sb->len) {
 		if (magic == ADD_LF_BEFORE_NON_EMPTY)
-			strbuf_insert(sb, orig_len, "\n", 1);
+			strbuf_insertstr(sb, orig_len, "\n");
 		else if (magic == ADD_SP_BEFORE_NON_EMPTY)
-			strbuf_insert(sb, orig_len, " ", 1);
+			strbuf_insertstr(sb, orig_len, " ");
 	}
 	return consumed + 1;
 }
diff --git a/strbuf.h b/strbuf.h
index bfa6656..aae7ac3 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -245,6 +245,18 @@
 void strbuf_insert(struct strbuf *sb, size_t pos, const void *, size_t);
 
 /**
+ * Insert a NUL-terminated string to the given position of the buffer.
+ * The remaining contents will be shifted, not overwritten.  It's an
+ * inline function to allow the compiler to resolve strlen() calls on
+ * constants at compile time.
+ */
+static inline void strbuf_insertstr(struct strbuf *sb, size_t pos,
+				    const char *s)
+{
+	strbuf_insert(sb, pos, s, strlen(s));
+}
+
+/**
  * Insert data to the given position of the buffer giving a printf format
  * string. The contents will be shifted, not overwritten.
  */