diff --git a/store.go b/store.go
index d17901e..faeab8e 100644
--- a/store.go
+++ b/store.go
@@ -108,12 +108,12 @@ func (s *Store) Claim(ctx context.Context, userId, player, province string, clai
 	}
 
 	// check that provided name matches the claim type
-	stmt, err := s.db.PrepareContext(ctx, fmt.Sprintf(`SELECT COUNT(1) FROM provinces WHERE provinces.%s = ?`, claimTypeToColumn[claimType]))
+	stmt, err := s.db.PrepareContext(ctx, fmt.Sprintf(`SELECT COUNT(1) FROM provinces WHERE LOWER(provinces.%s) = ?`, claimTypeToColumn[claimType]))
 	if err != nil {
 		return 0, fmt.Errorf("failed to prepare count query: %w", err)
 	}
 
-	row := stmt.QueryRowContext(ctx, province)
+	row := stmt.QueryRowContext(ctx, strings.ToLower(province))
 	var count int
 	err = row.Scan(&count)
 	if err != nil {
diff --git a/store_test.go b/store_test.go
index 8ab98c5..3cdd03e 100644
--- a/store_test.go
+++ b/store_test.go
@@ -68,6 +68,26 @@ func TestStore_Claim(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "case sensitivity lower",
+			args: args{
+				player:    "foo",
+				province:  "wien",
+				claimType: CLAIM_TYPE_TRADE,
+				userId:    "000000000000000001",
+			},
+			wantErr: false,
+		},
+		{
+			name: "case sensitivity upper",
+			args: args{
+				player:    "foo",
+				province:  "CONSTANTINOPLE",
+				claimType: CLAIM_TYPE_TRADE,
+				userId:    "000000000000000001",
+			},
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {