diff --git a/c/iostream.c b/c/iostream.c
index 88329c8..3f201a1 100644
--- a/c/iostream.c
+++ b/c/iostream.c
@@ -1,6 +1,7 @@
 #include <sys/types.h>
 
 #include <assert.h>
+#include <math.h>
 #include <setjmp.h>
 #include <stdarg.h>
 #include <stdint.h>
diff --git a/c/string.c b/c/string.c
index 9d83e3e..de55831 100644
--- a/c/string.c
+++ b/c/string.c
@@ -8,6 +8,7 @@
 #include <assert.h>
 #include <ctype.h>
 #include <errno.h>
+#include <math.h>
 #include <setjmp.h>
 #include <stdarg.h>
 #include <stdint.h>
diff --git a/c/table.c b/c/table.c
index 1f3e82e..f5a2057 100644
--- a/c/table.c
+++ b/c/table.c
@@ -1,6 +1,7 @@
 #include <sys/types.h>
 
 #include <assert.h>
+#include <math.h>
 #include <setjmp.h>
 #include <stdarg.h>
 #include <stdint.h>