diff --git a/spine-c/spine-c/src/spine/IkConstraint.c b/spine-c/spine-c/src/spine/IkConstraint.c
index 92f5efb9f..0deffeb2d 100644
--- a/spine-c/spine-c/src/spine/IkConstraint.c
+++ b/spine-c/spine-c/src/spine/IkConstraint.c
@@ -150,9 +150,6 @@ void spIkConstraint_apply2 (spBone* parent, spBone* child, float targetX, float
 		float aa = a * a, bb = b * b, ll = l1 * l1, dd = tx * tx + ty * ty, ta = ATAN2(ty, tx);
 		float c0 = bb * ll + aa * dd - aa * bb, c1 = -2 * bb * l1, c2 = bb - aa;
 		float d = c1 * c1 - 4 * c2 * c0;
-		float minAngle = PI, minX = l1 - a, minDist = minX * minX, minY = 0;
-		float maxAngle = 0, maxX = l1 + a, maxDist = maxX * maxX, maxY = 0;
-		float x = l1 + a, dist = x * x, angle, y;
 		if (d >= 0) {
 			float q = SQRT(d), r0, r1;
 			if (c1 < 0) q = -q;
@@ -166,28 +163,35 @@ void spIkConstraint_apply2 (spBone* parent, spBone* child, float targetX, float
 				goto outer;
 			}
 		}
-		angle = ACOS(-a * l1 / (aa - bb));
-		x = a * COS(angle) + l1;
-		y = b * SIN(angle);
-		dist = x * x + y * y;
-		if (dist < minDist) {
-			minAngle = angle;
-			minDist = dist;
-			minX = x;
-			minY = y;
-		}
-		if (dist > maxDist) {
-			maxAngle = angle;
-			maxDist = dist;
-			maxX = x;
-			maxY = y;
-		}
-		if (dd <= (minDist + maxDist) / 2) {
-			a1 = ta - ATAN2(minY * bendDir, minX);
-			a2 = minAngle * bendDir;
-		} else {
-			a1 = ta - ATAN2(maxY * bendDir, maxX);
-			a2 = maxAngle * bendDir;
+		{
+			float minAngle = PI, minX = l1 - a, minDist = minX * minX, minY = 0;
+			float maxAngle = 0, maxX = l1 + a, maxDist = maxX * maxX, maxY = 0;
+			c0 = -a * l1 / (aa - bb);
+			if (c0 >= -1 && c0 <= 1) {
+				c0 = ACOS(c0);
+				x = a * COS(c0) + l1;
+				y = b * SIN(c0);
+				d = x * x + y * y;
+				if (d < minDist) {
+					minAngle = c0;
+					minDist = d;
+					minX = x;
+					minY = y;
+				}
+				if (d > maxDist) {
+					maxAngle = c0;
+					maxDist = d;
+					maxX = x;
+					maxY = y;
+				}
+			}
+			if (dd <= (minDist + maxDist) / 2) {
+				a1 = ta - ATAN2(minY * bendDir, minX);
+				a2 = minAngle * bendDir;
+			} else {
+				a1 = ta - ATAN2(maxY * bendDir, maxX);
+				a2 = maxAngle * bendDir;
+			}
 		}
 	}
 	outer: {
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
index 8c693cd75..d6128a332 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
@@ -233,21 +233,24 @@ public class IkConstraint implements Constraint {
 			}
 			float minAngle = PI, minX = l1 - a, minDist = minX * minX, minY = 0;
 			float maxAngle = 0, maxX = l1 + a, maxDist = maxX * maxX, maxY = 0;
-			float angle = (float)Math.acos(-a * l1 / (aa - bb));
-			x = a * cos(angle) + l1;
-			y = b * sin(angle);
-			d = x * x + y * y;
-			if (d < minDist) {
-				minAngle = angle;
-				minDist = d;
-				minX = x;
-				minY = y;
-			}
-			if (d > maxDist) {
-				maxAngle = angle;
-				maxDist = d;
-				maxX = x;
-				maxY = y;
+			c = -a * l1 / (aa - bb);
+			if (c >= -1 && c <= 1) {
+				c = (float)Math.acos(c);
+				x = a * cos(c) + l1;
+				y = b * sin(c);
+				d = x * x + y * y;
+				if (d < minDist) {
+					minAngle = c;
+					minDist = d;
+					minX = x;
+					minY = y;
+				}
+				if (d > maxDist) {
+					maxAngle = c;
+					maxDist = d;
+					maxX = x;
+					maxY = y;
+				}
 			}
 			if (dd <= (minDist + maxDist) / 2) {
 				a1 = ta - atan2(minY * bendDir, minX);