diff --git a/cpp/Makefile b/cpp/Makefile
index 02c3ab16..62b1dc73 100644
--- a/cpp/Makefile
+++ b/cpp/Makefile
@@ -9,7 +9,7 @@ build: cmake
 	cmake --build ${BUILD_DIR}
 
 test: build
-	cmake --build ${BUILD_DIR} --target test
+	ctest --test-dir ${BUILD_DIR}
 
 clean:
 	rm -rf ${BUILD_DIR}/*
\ No newline at end of file
diff --git a/cpp/src/E4M3.h b/cpp/src/E4M3.h
index 37f6b523..ed241efd 100644
--- a/cpp/src/E4M3.h
+++ b/cpp/src/E4M3.h
@@ -21,6 +21,7 @@
 #pragma once
 
 #include <cmath>
+#include <string>
 
 static constexpr float ALL_E4M3_VALUES[256] = {
     0,
diff --git a/cpp/src/Enums.h b/cpp/src/Enums.h
index 885dada4..b0f3377c 100644
--- a/cpp/src/Enums.h
+++ b/cpp/src/Enums.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <string>
+
 /**
  * The space (i.e. distance metric) to use for searching.
  */