diff --git a/base/usr/include/math.h b/base/usr/include/math.h
index 3f1d6835..2e4968d0 100644
--- a/base/usr/include/math.h
+++ b/base/usr/include/math.h
@@ -36,6 +36,8 @@ extern double sinh(double x);
 extern double tan(double x);
 extern double tanh(double x);
 extern double atan(double x);
+extern double log1p(double x);
+extern double expm1(double x);
 
 extern double modf(double x, double *iptr);
 
diff --git a/kuroko b/kuroko
index 7e96bdee..fa6dbc83 160000
--- a/kuroko
+++ b/kuroko
@@ -1 +1 @@
-Subproject commit 7e96bdeec1e587a5304c2c8871d88f523df18334
+Subproject commit fa6dbc8365ed442f4fbb619827feb08b93a71e2f
diff --git a/libc/math/bad.c b/libc/math/bad.c
index 820eb9ec..a42b934b 100644
--- a/libc/math/bad.c
+++ b/libc/math/bad.c
@@ -1,6 +1,7 @@
 /* STUB MATH LIBRARY */
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 
 extern char * _argv_0;
 #define BAD do { if (getenv("LIBM_DEBUG")) { fprintf(stderr, "%s called bad math function %s\n", _argv_0, __func__); } } while (0)
@@ -39,3 +40,12 @@ double log2(double x) {
 	return 0.0;
 }
 
+double log1p(double x) {
+	BAD;
+	return log(x+1.0);
+}
+
+double expm1(double x) {
+	BAD;
+	return exp(x) - 1.0;
+}