diff --git a/racket/src/cs/c/configure b/racket/src/cs/c/configure
index ea82897a21..7a02a8c69c 100755
--- a/racket/src/cs/c/configure
+++ b/racket/src/cs/c/configure
@@ -3660,6 +3660,7 @@ case "$host_os" in
     ;;
   linux*)
     MACH_OS=le
+    LIBS="${LIBS} -lrt"
     ;;
   osf1*)
     ;;
diff --git a/racket/src/cs/c/configure.ac b/racket/src/cs/c/configure.ac
index d9093117d5..5eb51cbd81 100644
--- a/racket/src/cs/c/configure.ac
+++ b/racket/src/cs/c/configure.ac
@@ -151,6 +151,7 @@ case "$host_os" in
     ;;
   linux*)
     MACH_OS=le
+    LIBS="${LIBS} -lrt"
     ;;
   osf1*)
     ;;