diff --git a/include/cpputils/env_var.h b/include/cpputils/env_var.h
index e000f00..2a6da82 100644
--- a/include/cpputils/env_var.h
+++ b/include/cpputils/env_var.h
@@ -98,7 +98,7 @@ class EnvVarRegistry {
               if (x > upper_bound) {                                        \
                 return upper_bound;                                         \
               } else {                                                      \
-                return x;                                                   \
+                return static_cast<TYPE>(x);                                \
               }                                                             \
             } else {                                                        \
               auto x = std::stoll(c);                                       \
@@ -107,7 +107,7 @@ class EnvVarRegistry {
               } else if (x < lower_bound) {                                 \
                 return lower_bound;                                         \
               } else {                                                      \
-                return x;                                                   \
+                return static_cast<TYPE>(x);                                \
               }                                                             \
             }                                                               \
           } catch (...) {}                                                  \