diff --git a/include/fast_float/decimal_to_binary.h b/include/fast_float/decimal_to_binary.h
index e85f550..0dd05a2 100644
--- a/include/fast_float/decimal_to_binary.h
+++ b/include/fast_float/decimal_to_binary.h
@@ -10,7 +10,6 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
-#include <iostream>
 
 namespace fast_float {
 
diff --git a/include/fast_float/float_common.h b/include/fast_float/float_common.h
index f6ffcb6..90a111a 100644
--- a/include/fast_float/float_common.h
+++ b/include/fast_float/float_common.h
@@ -363,8 +363,8 @@ constexpr int binary_format<float>::smallest_power_of_ten() {
 } // namespace fast_float
 
 // for convenience:
-#include <ostream>
-inline std::ostream &operator<<(std::ostream &out, const fast_float::decimal &d) {
+template<class OStream>
+inline OStream& operator<<(OStream &out, const fast_float::decimal &d) {
   out << "0.";
   for (size_t i = 0; i < d.num_digits; i++) {
     out << int32_t(d.digits[i]);