diff --git a/re2/filtered_re2.cc b/re2/filtered_re2.cc
index f0995a10..e87ffc60 100644
--- a/re2/filtered_re2.cc
+++ b/re2/filtered_re2.cc
@@ -43,8 +43,10 @@ FilteredRE2::FilteredRE2(FilteredRE2&& other)
 }
 
 FilteredRE2& FilteredRE2::operator=(FilteredRE2&& other) {
-  this->~FilteredRE2();
-  (void) new (this) FilteredRE2(std::move(other));
+  if (this != &other) {
+    this->~FilteredRE2();
+    (void) new (this) FilteredRE2(std::move(other));
+  }
   return *this;
 }
 
diff --git a/re2/set.cc b/re2/set.cc
index 3f2a1f07..9064a96e 100644
--- a/re2/set.cc
+++ b/re2/set.cc
@@ -50,8 +50,10 @@ RE2::Set::Set(Set&& other)
 }
 
 RE2::Set& RE2::Set::operator=(Set&& other) {
-  this->~Set();
-  (void) new (this) Set(std::move(other));
+  if (this != &other) {
+    this->~Set();
+    (void) new (this) Set(std::move(other));
+  }
   return *this;
 }