diff --git a/android/guava/src/com/google/common/collect/MoreCollectors.java b/android/guava/src/com/google/common/collect/MoreCollectors.java
index 02b254d2d54c..f010eea73b5e 100644
--- a/android/guava/src/com/google/common/collect/MoreCollectors.java
+++ b/android/guava/src/com/google/common/collect/MoreCollectors.java
@@ -103,7 +103,7 @@ private static final class ToOptionalState {
       extras = emptyList();
     }
 
-    IllegalArgumentException multiples(boolean overflow) {
+    void multiples(boolean overflow) {
       StringBuilder sb =
           new StringBuilder().append("expected one element but was: <").append(element);
       for (Object o : extras) {
@@ -127,7 +127,7 @@ void add(Object o) {
       } else if (extras.size() < MAX_EXTRAS) {
         extras.add(o);
       } else {
-        throw multiples(true);
+        multiples(true);
       }
     }
 
@@ -145,7 +145,7 @@ ToOptionalState combine(ToOptionalState other) {
         extras.addAll(other.extras);
         if (extras.size() > MAX_EXTRAS) {
           extras.subList(MAX_EXTRAS, extras.size()).clear();
-          throw multiples(true);
+          multiples(true);
         }
         return this;
       }
@@ -156,7 +156,7 @@ Optional<Object> getOptional() {
       if (extras.isEmpty()) {
         return Optional.ofNullable(element);
       } else {
-        throw multiples(false);
+        multiples(false);
       }
     }
 
@@ -166,7 +166,7 @@ Object getElement() {
       } else if (extras.isEmpty()) {
         return element;
       } else {
-        throw multiples(false);
+        multiples(false);
       }
     }
   }
diff --git a/guava/src/com/google/common/collect/MoreCollectors.java b/guava/src/com/google/common/collect/MoreCollectors.java
index 3c57ea0a9388..027fc7ff8c89 100644
--- a/guava/src/com/google/common/collect/MoreCollectors.java
+++ b/guava/src/com/google/common/collect/MoreCollectors.java
@@ -102,7 +102,7 @@ private static final class ToOptionalState {
       extras = emptyList();
     }
 
-    IllegalArgumentException multiples(boolean overflow) {
+    void multiples(boolean overflow) {
       StringBuilder sb =
           new StringBuilder().append("expected one element but was: <").append(element);
       for (Object o : extras) {
@@ -126,7 +126,7 @@ void add(Object o) {
       } else if (extras.size() < MAX_EXTRAS) {
         extras.add(o);
       } else {
-        throw multiples(true);
+        multiples(true);
       }
     }
 
@@ -144,7 +144,7 @@ ToOptionalState combine(ToOptionalState other) {
         extras.addAll(other.extras);
         if (extras.size() > MAX_EXTRAS) {
           extras.subList(MAX_EXTRAS, extras.size()).clear();
-          throw multiples(true);
+          multiples(true);
         }
         return this;
       }
@@ -154,7 +154,7 @@ Optional<Object> getOptional() {
       if (extras.isEmpty()) {
         return Optional.ofNullable(element);
       } else {
-        throw multiples(false);
+        multiples(false);
       }
     }
 
@@ -164,7 +164,7 @@ Object getElement() {
       } else if (extras.isEmpty()) {
         return element;
       } else {
-        throw multiples(false);
+        multiples(false);
       }
     }
   }