diff --git a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/BitwiseLinearlyInterpolatedMapping.java b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/BitwiseLinearlyInterpolatedMapping.java
index 69e873c..781ea4a 100644
--- a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/BitwiseLinearlyInterpolatedMapping.java
+++ b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/BitwiseLinearlyInterpolatedMapping.java
@@ -35,7 +35,7 @@ public BitwiseLinearlyInterpolatedMapping(double relativeAccuracy) {
     this(getMinNumSignificantBinaryDigits(relativeAccuracy));
   }
 
-  BitwiseLinearlyInterpolatedMapping(int numSignificantBinaryDigits) {
+  public BitwiseLinearlyInterpolatedMapping(int numSignificantBinaryDigits) {
     if (numSignificantBinaryDigits < 0) {
       throw new IllegalArgumentException(
           "The number of significant binary digits cannot be negative.");
diff --git a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/CubicallyInterpolatedMapping.java b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/CubicallyInterpolatedMapping.java
index 3b5dca1..94e8670 100644
--- a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/CubicallyInterpolatedMapping.java
+++ b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/CubicallyInterpolatedMapping.java
@@ -88,7 +88,7 @@ public CubicallyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  CubicallyInterpolatedMapping(double gamma, double indexOffset) {
+  public CubicallyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 
diff --git a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LinearlyInterpolatedMapping.java b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LinearlyInterpolatedMapping.java
index 01d53c1..bf6139c 100644
--- a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LinearlyInterpolatedMapping.java
+++ b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LinearlyInterpolatedMapping.java
@@ -25,7 +25,7 @@ public LinearlyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  LinearlyInterpolatedMapping(double gamma, double indexOffset) {
+  public LinearlyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 
diff --git a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LogarithmicMapping.java b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LogarithmicMapping.java
index b749812..a04ec0a 100644
--- a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LogarithmicMapping.java
+++ b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/LogarithmicMapping.java
@@ -21,7 +21,7 @@ public LogarithmicMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  LogarithmicMapping(double gamma, double indexOffset) {
+  public LogarithmicMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 
diff --git a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuadraticallyInterpolatedMapping.java b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuadraticallyInterpolatedMapping.java
index a04b7c9..1bfe539 100644
--- a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuadraticallyInterpolatedMapping.java
+++ b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuadraticallyInterpolatedMapping.java
@@ -25,7 +25,7 @@ public QuadraticallyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  QuadraticallyInterpolatedMapping(double gamma, double indexOffset) {
+  public QuadraticallyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }
 
diff --git a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuarticallyInterpolatedMapping.java b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuarticallyInterpolatedMapping.java
index 5774fe5..bc0dff2 100644
--- a/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuarticallyInterpolatedMapping.java
+++ b/src/main/java/com/datadoghq/sketch/ddsketch/mapping/QuarticallyInterpolatedMapping.java
@@ -29,7 +29,7 @@ public QuarticallyInterpolatedMapping(double relativeAccuracy) {
   }
 
   /** {@inheritDoc} */
-  QuarticallyInterpolatedMapping(double gamma, double indexOffset) {
+  public QuarticallyInterpolatedMapping(double gamma, double indexOffset) {
     super(gamma, indexOffset);
   }