diff --git a/CMakeLists.txt b/CMakeLists.txt
index a796024..e049d27 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,6 +88,8 @@ set(SOURCES
   # inttypes
   src/libc/inttypes/imaxabs.c
   src/libc/inttypes/imaxdiv.c
+  src/libc/inttypes/strtoimax.c
+  src/libc/inttypes/strtoumax.c
   # locale
   src/libc/locale/setlocale.c
   src/libc/locale/localeconv.c
diff --git a/STATUS b/STATUS
index db0b572..a1d50cf 100644
--- a/STATUS
+++ b/STATUS
@@ -47,7 +47,7 @@ DONE:       Function/symbol/macro is defined, builds, links, and is tested
     7.8.1   SCN* macros: LDEPS(*scanf)
     7.8.2.1 imaxabs: DONE
     7.8.2.2 imaxdiv: DONE
-    7.8.2.3 strotimax strtoumax: TODO
+    7.8.2.3 strtoimax strtoumax: DONE
     7.8.2.4 wcstoimax wcstoumax: TODO
 
 7.9 <iso646.h>
diff --git a/include/inttypes.h b/include/inttypes.h
index 076b3f0..8e568f4 100644
--- a/include/inttypes.h
+++ b/include/inttypes.h
@@ -243,4 +243,16 @@ extern intmax_t imaxabs(intmax_t __j);
 extern imaxdiv_t imaxdiv(intmax_t __num, intmax_t __denom);
 #define imaxdiv lldiv
 
+/* Parse an intmax_t from string. */
+extern intmax_t strtoimax(
+	char const * restrict __ptr,
+	char ** restrict __endptr,
+	int __base);
+
+/* Parse an uintmax_t from string. */
+extern uintmax_t strtoumax(
+	char const * restrict __ptr,
+	char ** restrict __endptr,
+	int __base);
+
 #endif /*__INTTYPES_H__*/
diff --git a/src/libc/inttypes/strtoimax.c b/src/libc/inttypes/strtoimax.c
new file mode 100644
index 0000000..2a948b9
--- /dev/null
+++ b/src/libc/inttypes/strtoimax.c
@@ -0,0 +1,16 @@
+#include <inttypes.h>
+#include <stdlib.h>
+
+#if __INTMAX_WIDTH__ == __LONG_WIDTH__
+# define __strtoimax strtol
+#elif __INTMAX_WIDTH__ == __LONG_LONG_WIDTH__
+# define __strtoimax strtoll
+#else
+# error How is intmax_t neither long nor long long?
+#endif
+
+intmax_t strtoimax(char const * restrict ptr, char ** restrict endptr,
+	int base)
+{
+	return __strtoimax(ptr, endptr, base);
+}
diff --git a/src/libc/inttypes/strtoumax.c b/src/libc/inttypes/strtoumax.c
new file mode 100644
index 0000000..6a359cf
--- /dev/null
+++ b/src/libc/inttypes/strtoumax.c
@@ -0,0 +1,16 @@
+#include <inttypes.h>
+#include <stdlib.h>
+
+#if __INTMAX_WIDTH__ == __LONG_WIDTH__
+# define __strtoumax strtoul
+#elif __INTMAX_WIDTH__ == __LONG_LONG_WIDTH__
+# define __strtoumax strtoull
+#else
+# error How is uintmax_t neither unsigned long nor unsigned long long?
+#endif
+
+uintmax_t strtoumax(char const * restrict ptr, char ** restrict endptr,
+	int base)
+{
+	return __strtoumax(ptr, endptr, base);
+}