diff --git a/lokimq/base32z.h b/lokimq/base32z.h
index 03e0c1c..d0227d3 100644
--- a/lokimq/base32z.h
+++ b/lokimq/base32z.h
@@ -27,6 +27,7 @@
 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #pragma once
+#include <string>
 #include <string_view>
 #include <array>
 #include <iterator>
diff --git a/lokimq/base64.h b/lokimq/base64.h
index 91d126e..172c4cc 100644
--- a/lokimq/base64.h
+++ b/lokimq/base64.h
@@ -27,6 +27,7 @@
 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #pragma once
+#include <string>
 #include <string_view>
 #include <array>
 #include <iterator>
diff --git a/lokimq/hex.h b/lokimq/hex.h
index a3ce862..6998b9a 100644
--- a/lokimq/hex.h
+++ b/lokimq/hex.h
@@ -27,6 +27,7 @@
 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #pragma once
+#include <string>
 #include <string_view>
 #include <array>
 #include <iterator>