diff --git a/src/main/java/com/android/tools/r8/inspector/BooleanValueInspector.java b/src/main/java/com/android/tools/r8/inspector/BooleanValueInspector.java
index 1fba365..105f577 100644
--- a/src/main/java/com/android/tools/r8/inspector/BooleanValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/BooleanValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface BooleanValueInspector extends ValueInspector {
   boolean getBooleanValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/ByteValueInspector.java b/src/main/java/com/android/tools/r8/inspector/ByteValueInspector.java
index 718183e..045476d 100644
--- a/src/main/java/com/android/tools/r8/inspector/ByteValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/ByteValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface ByteValueInspector extends ValueInspector {
   byte getByteValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/CharValueInspector.java b/src/main/java/com/android/tools/r8/inspector/CharValueInspector.java
index d79ee9c..05d5c2b 100644
--- a/src/main/java/com/android/tools/r8/inspector/CharValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/CharValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface CharValueInspector extends ValueInspector {
   char getCharValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/DoubleValueInspector.java b/src/main/java/com/android/tools/r8/inspector/DoubleValueInspector.java
index 334f7ac..e9ac7e1 100644
--- a/src/main/java/com/android/tools/r8/inspector/DoubleValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/DoubleValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface DoubleValueInspector extends ValueInspector {
   double getDoubleValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/FloatValueInspector.java b/src/main/java/com/android/tools/r8/inspector/FloatValueInspector.java
index cb4c12d..a7be463 100644
--- a/src/main/java/com/android/tools/r8/inspector/FloatValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/FloatValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface FloatValueInspector extends ValueInspector {
   float getFloatValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/IntValueInspector.java b/src/main/java/com/android/tools/r8/inspector/IntValueInspector.java
index 38376c2..6b43ac8 100644
--- a/src/main/java/com/android/tools/r8/inspector/IntValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/IntValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface IntValueInspector extends ValueInspector {
   int getIntValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/LongValueInspector.java b/src/main/java/com/android/tools/r8/inspector/LongValueInspector.java
index 177a885..987721e 100644
--- a/src/main/java/com/android/tools/r8/inspector/LongValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/LongValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface LongValueInspector extends ValueInspector {
   long getLongValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/ShortValueInspector.java b/src/main/java/com/android/tools/r8/inspector/ShortValueInspector.java
index fb1d823..6b01df3 100644
--- a/src/main/java/com/android/tools/r8/inspector/ShortValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/ShortValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface ShortValueInspector extends ValueInspector {
   short getShortValue();
 }
diff --git a/src/main/java/com/android/tools/r8/inspector/StringValueInspector.java b/src/main/java/com/android/tools/r8/inspector/StringValueInspector.java
index c0b78c4..5336948 100644
--- a/src/main/java/com/android/tools/r8/inspector/StringValueInspector.java
+++ b/src/main/java/com/android/tools/r8/inspector/StringValueInspector.java
@@ -3,6 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.inspector;
 
+import com.android.tools.r8.Keep;
+
+@Keep
 public interface StringValueInspector extends ValueInspector {
   String getStringValue();
 }