diff --git a/src/common/slurm_strcasestr.c b/src/common/slurm_strcasestr.c
index 944b45e6cfe7f5ca9d8e2fa7fc7526b98206c152..f4e34b740ce738158d01329fdaf55ce68cae7ec5 100644
--- a/src/common/slurm_strcasestr.c
+++ b/src/common/slurm_strcasestr.c
@@ -37,6 +37,7 @@
 \*****************************************************************************/
 
 #include "slurm_strcasestr.h"
+#include <string.h>
 #include <ctype.h>
 
 /* case insensitve version of strstr() */