diff --git a/userspace/libraries/LibC/CMakeLists.txt b/userspace/libraries/LibC/CMakeLists.txt
index 113d0c0a1c..1ad81877cb 100644
--- a/userspace/libraries/LibC/CMakeLists.txt
+++ b/userspace/libraries/LibC/CMakeLists.txt
@@ -5,6 +5,7 @@ set(LIBC_SOURCES
 	dirent.cpp
 	fcntl.cpp
 	grp.cpp
+	inttypes.cpp
 	locale.cpp
 	malloc.cpp
 	math.cpp
diff --git a/userspace/libraries/LibC/inttypes.cpp b/userspace/libraries/LibC/inttypes.cpp
new file mode 100644
index 0000000000..3da954be57
--- /dev/null
+++ b/userspace/libraries/LibC/inttypes.cpp
@@ -0,0 +1,14 @@
+#include <inttypes.h>
+#include <stdlib.h>
+
+intmax_t strtoimax(const char* __restrict nptr, char** __restrict endptr, int base)
+{
+	static_assert(sizeof(intmax_t) == sizeof(long long));
+	return strtoll(nptr, endptr, base);
+}
+
+uintmax_t strtoumax(const char* __restrict nptr, char** __restrict endptr, int base)
+{
+	static_assert(sizeof(uintmax_t) == sizeof(unsigned long long));
+	return strtoull(nptr, endptr, base);
+}