diff --git a/libc/libc.csv b/libc/libc.csv
index c8e4bed84b..46a193be2c 100644
--- a/libc/libc.csv
+++ b/libc/libc.csv
@@ -31,6 +31,7 @@
 "fclose","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *"
 "fdopen","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","FAR FILE","int","FAR const char *"
 "fflush","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *"
+"ffs","strings.h","","int","int"
 "fgetc","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *"
 "fgetpos","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","int","FAR FILE *","FAR fpos_t *"
 "fgets","stdio.h","CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0","FAR char","FAR char *","int","FAR FILE *"
@@ -143,7 +144,7 @@
 "sq_remlast","queue.h","","FAR sq_entry_t","sq_queue_t *"
 "srand","stdlib.h","","void","unsigned int"
 "sscanf","stdio.h","","int","FAR const char *","FAR const char *","..."
-"strcasecmp","string.h","","int","FAR const char *","FAR const char *"
+"strcasecmp","strings.h","","int","FAR const char *","FAR const char *"
 "strcasestr","string.h","","FAR char","FAR const char *","FAR const char *"
 "strcat","string.h","","FAR char","FAR char *","FAR const char *"
 "strchr","string.h","","FAR char","FAR const char *","int"
@@ -155,7 +156,7 @@
 "strerror","string.h","","FAR const char","int"
 "strftime","time.h","","size_t","FAR char *","size_t","FAR const char *","FAR const struct tm *"
 "strlen","string.h","","size_t","FAR const char *"
-"strncasecmp","string.h","","int","FAR const char *","FAR const char *","size_t"
+"strncasecmp","strings.h","","int","FAR const char *","FAR const char *","size_t"
 "strncat","string.h","","FAR char","FAR char *","FAR const char *","size_t"
 "strncmp","string.h","","int","FAR const char *","FAR const char *","size_t"
 "strncpy","string.h","","FAR char","FAR char *","FAR const char *","size_t"