diff --git a/include/nlohmann/detail/input/binary_reader.hpp b/include/nlohmann/detail/input/binary_reader.hpp
index 19aae087..048f9364 100644
--- a/include/nlohmann/detail/input/binary_reader.hpp
+++ b/include/nlohmann/detail/input/binary_reader.hpp
@@ -64,7 +64,7 @@ class binary_reader
                    const bool strict = true)
     {
         sax = sax_;
-        bool result;
+        bool result = false;
 
         switch (format)
         {
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 485cc7a8..84042f14 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -6033,7 +6033,7 @@ class binary_reader
                    const bool strict = true)
     {
         sax = sax_;
-        bool result;
+        bool result = false;
 
         switch (format)
         {