diff --git a/src/main/java/io/leangen/geantyref/AnnotatedArrayTypeImpl.java b/src/main/java/io/leangen/geantyref/AnnotatedArrayTypeImpl.java
index 48122f5..a487745 100644
--- a/src/main/java/io/leangen/geantyref/AnnotatedArrayTypeImpl.java
+++ b/src/main/java/io/leangen/geantyref/AnnotatedArrayTypeImpl.java
@@ -32,6 +32,6 @@ public boolean equals(Object other) {
 
     @Override
     public int hashCode() {
-        return super.hashCode() + componentType.hashCode();
+        return super.hashCode() ^ componentType.hashCode();
     }
 }
diff --git a/src/main/java/io/leangen/geantyref/AnnotatedCaptureTypeImpl.java b/src/main/java/io/leangen/geantyref/AnnotatedCaptureTypeImpl.java
index 133ce24..ff1d297 100644
--- a/src/main/java/io/leangen/geantyref/AnnotatedCaptureTypeImpl.java
+++ b/src/main/java/io/leangen/geantyref/AnnotatedCaptureTypeImpl.java
@@ -134,7 +134,7 @@ public AnnotatedWildcardType getAnnotatedWildcardType() {
 
     @Override
     public int hashCode() {
-        return wildcard.hashCode() + variable.hashCode();
+        return wildcard.hashCode() ^ variable.hashCode();
     }
 
     @Override
diff --git a/src/main/java/io/leangen/geantyref/AnnotatedParameterizedTypeImpl.java b/src/main/java/io/leangen/geantyref/AnnotatedParameterizedTypeImpl.java
index e123804..d1e0188 100644
--- a/src/main/java/io/leangen/geantyref/AnnotatedParameterizedTypeImpl.java
+++ b/src/main/java/io/leangen/geantyref/AnnotatedParameterizedTypeImpl.java
@@ -32,6 +32,6 @@ public boolean equals(Object other) {
 
     @Override
     public int hashCode() {
-        return super.hashCode() + Arrays.hashCode(typeArguments);
+        return super.hashCode() ^ Arrays.hashCode(typeArguments);
     }
 }
diff --git a/src/main/java/io/leangen/geantyref/AnnotatedTypeImpl.java b/src/main/java/io/leangen/geantyref/AnnotatedTypeImpl.java
index a48ef47..748e77a 100644
--- a/src/main/java/io/leangen/geantyref/AnnotatedTypeImpl.java
+++ b/src/main/java/io/leangen/geantyref/AnnotatedTypeImpl.java
@@ -58,6 +58,6 @@ public boolean equals(Object other) {
 
     @Override
     public int hashCode() {
-        return 31 * (this.getType().hashCode() + Arrays.hashCode(this.getAnnotations()));
+        return 31 * (this.getType().hashCode() ^ Arrays.hashCode(this.getAnnotations()));
     }
 }
diff --git a/src/main/java/io/leangen/geantyref/AnnotatedTypeVariableImpl.java b/src/main/java/io/leangen/geantyref/AnnotatedTypeVariableImpl.java
index babe1e1..b9e2cc5 100644
--- a/src/main/java/io/leangen/geantyref/AnnotatedTypeVariableImpl.java
+++ b/src/main/java/io/leangen/geantyref/AnnotatedTypeVariableImpl.java
@@ -40,6 +40,6 @@ public boolean equals(Object other) {
 
     @Override
     public int hashCode() {
-        return super.hashCode() + Arrays.hashCode(annotatedBounds);
+        return super.hashCode() ^ Arrays.hashCode(annotatedBounds);
     }
 }
diff --git a/src/main/java/io/leangen/geantyref/AnnotatedWildcardTypeImpl.java b/src/main/java/io/leangen/geantyref/AnnotatedWildcardTypeImpl.java
index 5a19cd4..ce6ff69 100644
--- a/src/main/java/io/leangen/geantyref/AnnotatedWildcardTypeImpl.java
+++ b/src/main/java/io/leangen/geantyref/AnnotatedWildcardTypeImpl.java
@@ -44,6 +44,6 @@ public boolean equals(Object other) {
 
     @Override
     public int hashCode() {
-        return super.hashCode() + Arrays.hashCode(lowerBounds) + Arrays.hashCode(upperBounds);
+        return super.hashCode() ^ Arrays.hashCode(lowerBounds) ^ Arrays.hashCode(upperBounds);
     }
 }