diff --git a/helper_test.go b/helper_test.go
index 283306a..db6bdb9 100644
--- a/helper_test.go
+++ b/helper_test.go
@@ -38,5 +38,6 @@ func resetMocks() {
 	issuesMu.Lock()
 	issues = nil
 	notices = nil
+	errorCount = 0
 	issuesMu.Unlock()
 }
diff --git a/issues.go b/issues.go
index f1a0076..356054d 100644
--- a/issues.go
+++ b/issues.go
@@ -13,9 +13,10 @@ import (
 // when there's something to report.
 
 var (
-	issuesMu sync.Mutex
-	issues   []string
-	notices  []string
+	issuesMu   sync.Mutex
+	issues     []string
+	notices    []string
+	errorCount int
 )
 
 func logIssue(level, msg string) {
@@ -23,11 +24,20 @@ func logIssue(level, msg string) {
 	defer issuesMu.Unlock()
 	fmt.Printf("  [%s] %s\n", level, msg)
 	issues = append(issues, fmt.Sprintf("[%s] %s", level, msg))
+	if level == "ERROR" {
+		errorCount++
+	}
 }
 
 func warn(msg string)   { logIssue("WARN", msg) }
 func errLog(msg string) { logIssue("ERROR", msg) }
 
+func hasErrors() bool {
+	issuesMu.Lock()
+	defer issuesMu.Unlock()
+	return errorCount > 0
+}
+
 func notice(msg string) {
 	issuesMu.Lock()
 	defer issuesMu.Unlock()
diff --git a/issues_test.go b/issues_test.go
index 0ed99db..f8905d6 100644
--- a/issues_test.go
+++ b/issues_test.go
@@ -38,6 +38,7 @@ func TestIssuesLogging(t *testing.T) {
 	issuesMu.Lock()
 	issueLen := len(issues)
 	noticeLen := len(notices)
+	errCount := errorCount
 	issuesMu.Unlock()
 
 	if issueLen != 2 {
@@ -46,6 +47,12 @@ func TestIssuesLogging(t *testing.T) {
 	if noticeLen != 1 {
 		t.Errorf("expected 1 notice, got %d", noticeLen)
 	}
+	if errCount != 1 {
+		t.Errorf("expected 1 error count, got %d", errCount)
+	}
+	if !hasErrors() {
+		t.Error("expected hasErrors() to return true after errLog call")
+	}
 }
 
 func TestWriteRunLog(t *testing.T) {
@@ -83,6 +90,24 @@ func TestWriteRunLog(t *testing.T) {
 	}
 }
 
+func TestHasErrors(t *testing.T) {
+	defer resetMocks()
+
+	if hasErrors() {
+		t.Error("expected hasErrors() false with no errors logged")
+	}
+
+	warn("just a warning")
+	if hasErrors() {
+		t.Error("expected hasErrors() false after only a warning")
+	}
+
+	errLog("a real error")
+	if !hasErrors() {
+		t.Error("expected hasErrors() true after errLog call")
+	}
+}
+
 func TestPrintNotices(t *testing.T) {
 	defer resetMocks()
 
diff --git a/main.go b/main.go
index c5e19af..4b27ba0 100644
--- a/main.go
+++ b/main.go
@@ -169,6 +169,11 @@ func runMain(args []string) {
 	printNotices()
 	fmt.Println("\nDone.")
 
+	if hasErrors() {
+		osExit(1)
+		return
+	}
+
 	home, _ := os.UserHomeDir()
 	zshrc := filepath.Join(home, ".zshrc")
 	if hasCmd("zsh") {