diff --git a/internal/infrastructure/http/auth_handlers.go b/internal/infrastructure/http/auth_handlers.go
index 8a761a4..5bda0d3 100644
--- a/internal/infrastructure/http/auth_handlers.go
+++ b/internal/infrastructure/http/auth_handlers.go
@@ -96,7 +96,7 @@ type LogoutRequest struct {
 // @Produce json
 // @Param request body RegisterRequest true "Registration data (password requires: min 8 chars, uppercase, lowercase, digit, special char)"
 // @Success 201 {object} RegisterResponse "Returns user ID and message about next steps"
-// @Failure 400 {object} ErrorResponse "Invalid input: email format, password requirements, or timezone"
+// @Failure 400 {object} ValidationErrorResponse "Invalid input: email format, password requirements, or timezone"
 // @Failure 403 {object} ErrorResponse "Registration is closed"
 // @Failure 409 {object} ErrorResponse "Email already registered"
 // @Failure 500 {object} ErrorResponse "Internal server error"
diff --git a/internal/infrastructure/http/dto.go b/internal/infrastructure/http/dto.go
index 2f7f06f..b207f1e 100644
--- a/internal/infrastructure/http/dto.go
+++ b/internal/infrastructure/http/dto.go
@@ -85,6 +85,10 @@ type HabitEntriesResponse struct {
 }
 
 type ErrorResponse struct {
-	Error string  `json:"error"`
-	Field *string `json:"field,omitempty"`
+	Error string `json:"error"`
+}
+
+type ValidationErrorResponse struct {
+	Error string `json:"error"`
+	Field string `json:"field"`
 }
diff --git a/internal/infrastructure/http/habit_handlers.go b/internal/infrastructure/http/habit_handlers.go
index 5f80fcb..385f6ed 100644
--- a/internal/infrastructure/http/habit_handlers.go
+++ b/internal/infrastructure/http/habit_handlers.go
@@ -594,19 +594,22 @@ func respondError(w http.ResponseWriter, status int, message string) {
 
 func respondValidationError(w http.ResponseWriter, err error) {
 	errMsg := err.Error()
-	var field *string
+	var field string
 
 	if strings.Contains(errMsg, ": ") {
 		parts := strings.SplitN(errMsg, ": ", 3)
 		if len(parts) >= 3 {
-			fieldName := parts[1]
-			field = &fieldName
+			field = parts[1]
 			errMsg = parts[2]
+			respondJSON(w, http.StatusBadRequest, ValidationErrorResponse{
+				Error: errMsg,
+				Field: field,
+			})
+			return
 		}
 	}
 
 	respondJSON(w, http.StatusBadRequest, ErrorResponse{
 		Error: errMsg,
-		Field: field,
 	})
 }