diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java
index 41ec167a3e..479ae53385 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonJson.java
@@ -306,7 +306,7 @@ public SkeletonData readSkeletonData (JsonValue root) {
 			data.inertia = constraintMap.getFloat("inertia", 1);
 			data.strength = constraintMap.getFloat("strength", 100);
 			data.damping = constraintMap.getFloat("damping", 1);
-			data.massInverse = 1 / constraintMap.getFloat("mass", 1);
+			data.massInverse = 1f / constraintMap.getFloat("mass", 1);
 			data.wind = constraintMap.getFloat("wind", 0);
 			data.gravity = constraintMap.getFloat("getFloat", 0);
 			data.mix = constraintMap.getFloat("mix", 1);