diff --git a/src/main/java/com/github/davidmoten/rtree/geometry/internal/LineFloat.java b/src/main/java/com/github/davidmoten/rtree/geometry/internal/LineFloat.java
index 0c1766b7..d1f6bc2f 100644
--- a/src/main/java/com/github/davidmoten/rtree/geometry/internal/LineFloat.java
+++ b/src/main/java/com/github/davidmoten/rtree/geometry/internal/LineFloat.java
@@ -17,19 +17,19 @@
  */
 public final class LineFloat implements Line {
 
-    private final double x1;
-    private final double y1;
-    private final double x2;
-    private final double y2;
+    private final float x1;
+    private final float y1;
+    private final float x2;
+    private final float y2;
 
-    private LineFloat(double x1, double y1, double x2, double y2) {
+    private LineFloat(float x1, float y1, float x2, float y2) {
         this.x1 = x1;
         this.y1 = y1;
         this.x2 = x2;
         this.y2 = y2;
     }
 
-    public static LineFloat create(double x1, double y1, double x2, double y2) {
+    public static LineFloat create(float x1, float y1, float x2, float y2) {
         return new LineFloat(x1, y1, x2, y2);
     }
 
diff --git a/src/test/java/com/github/davidmoten/rtree/geometry/LineTest.java b/src/test/java/com/github/davidmoten/rtree/geometry/LineTest.java
index 7d7e0c52..4c86898e 100644
--- a/src/test/java/com/github/davidmoten/rtree/geometry/LineTest.java
+++ b/src/test/java/com/github/davidmoten/rtree/geometry/LineTest.java
@@ -9,6 +9,9 @@
 
 import org.junit.Test;
 
+import com.github.davidmoten.rtree.geometry.internal.LineDouble;
+import com.github.davidmoten.rtree.geometry.internal.LineFloat;
+
 public final class LineTest {
 
     private static final double PRECISION = 0.00001;
@@ -222,4 +225,21 @@ public void testLineFloatIntersectsWithHorizontalLine() {
         }
     }
 
+    @Test
+    public void testLineFloatStoresCoordinatesAsFloatNotDouble() throws NoSuchFieldException {
+        // https://github.com/davidmoten/rtree/issues/89
+        for (String field : new String[] { "x1", "y1", "x2", "y2" }) {
+            assertEquals(float.class, LineFloat.class.getDeclaredField(field).getType());
+        }
+        for (String field : new String[] { "x1", "y1", "x2", "y2" }) {
+            assertEquals(double.class, LineDouble.class.getDeclaredField(field).getType());
+        }
+    }
+
+    @Test
+    public void testLineFloatIsNotDoublePrecision() {
+        assertFalse(Geometries.line(1f, 2f, 3f, 4f).isDoublePrecision());
+        assertTrue(Geometries.line(1d, 2d, 3d, 4d).isDoublePrecision());
+    }
+
 }