diff --git a/pkg/mining/errors.go b/pkg/mining/errors.go
index 9eef3f9..ac9ecd7 100644
--- a/pkg/mining/errors.go
+++ b/pkg/mining/errors.go
@@ -24,7 +24,6 @@ const (
 	ErrCodeProfileNotFound    = "PROFILE_NOT_FOUND"
 	ErrCodeProfileExists      = "PROFILE_EXISTS"
 	ErrCodeInternalError      = "INTERNAL_ERROR"
-	ErrCodeInternal           = "INTERNAL_ERROR" // Alias for consistency
 )
 
 // e := &MiningError{Code: ErrCodeStartFailed, Message: "failed to start xmrig", HTTPStatus: 500}
diff --git a/pkg/mining/node_service.go b/pkg/mining/node_service.go
index e1ae86a..cc294e1 100644
--- a/pkg/mining/node_service.go
+++ b/pkg/mining/node_service.go
@@ -275,7 +275,7 @@ func (ns *NodeService) handlePingPeer(c *gin.Context) {
 			respondWithError(c, http.StatusNotFound, "PEER_NOT_FOUND", "peer not found or not connected", err.Error())
 			return
 		}
-		respondWithError(c, http.StatusInternalServerError, ErrCodeInternal, "ping failed", err.Error())
+		respondWithError(c, http.StatusInternalServerError, ErrCodeInternalError, "ping failed", err.Error())
 		return
 	}
 	c.JSON(http.StatusOK, gin.H{"rtt_ms": rtt})
@@ -319,7 +319,7 @@ func (ns *NodeService) handleDisconnectPeer(c *gin.Context) {
 			c.JSON(http.StatusOK, gin.H{"status": "disconnected"})
 			return
 		}
-		respondWithError(c, http.StatusInternalServerError, ErrCodeInternal, "disconnect failed", err.Error())
+		respondWithError(c, http.StatusInternalServerError, ErrCodeInternalError, "disconnect failed", err.Error())
 		return
 	}
 	c.JSON(http.StatusOK, gin.H{"status": "disconnected"})
diff --git a/pkg/mining/service.go b/pkg/mining/service.go
index e1692cb..2e25476 100644
--- a/pkg/mining/service.go
+++ b/pkg/mining/service.go
@@ -1187,7 +1187,7 @@ func (s *Service) handleCreateProfile(c *gin.Context) {
 
 	createdProfile, err := s.ProfileManager.CreateProfile(&profile)
 	if err != nil {
-		respondWithError(c, http.StatusInternalServerError, ErrCodeInternal, "failed to create profile", err.Error())
+		respondWithError(c, http.StatusInternalServerError, ErrCodeInternalError, "failed to create profile", err.Error())
 		return
 	}
 
@@ -1238,7 +1238,7 @@ func (s *Service) handleUpdateProfile(c *gin.Context) {
 			respondWithError(c, http.StatusNotFound, ErrCodeProfileNotFound, "profile not found", err.Error())
 			return
 		}
-		respondWithError(c, http.StatusInternalServerError, ErrCodeInternal, "failed to update profile", err.Error())
+		respondWithError(c, http.StatusInternalServerError, ErrCodeInternalError, "failed to update profile", err.Error())
 		return
 	}
 	c.JSON(http.StatusOK, profile)
@@ -1260,7 +1260,7 @@ func (s *Service) handleDeleteProfile(c *gin.Context) {
 			c.JSON(http.StatusOK, gin.H{"status": "profile deleted"})
 			return
 		}
-		respondWithError(c, http.StatusInternalServerError, ErrCodeInternal, "failed to delete profile", err.Error())
+		respondWithError(c, http.StatusInternalServerError, ErrCodeInternalError, "failed to delete profile", err.Error())
 		return
 	}
 	c.JSON(http.StatusOK, gin.H{"status": "profile deleted"})