diff --git a/theme/boost/scss/moodle/calendar.scss b/theme/boost/scss/moodle/calendar.scss
index 5db0a490d09..f8fd34f069e 100644
--- a/theme/boost/scss/moodle/calendar.scss
+++ b/theme/boost/scss/moodle/calendar.scss
@@ -439,5 +439,5 @@ table.calendartable caption {
 }
 
 .cal_courses_flt {
-    color: #868e96;
+    color: $gray-600;
 }
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index d8ee9ea2ea3..d183335f3d5 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -12612,7 +12612,7 @@ table.calendartable caption {
     margin: 0; }
 
 .cal_courses_flt {
-  color: #868e96; }
+  color: #6c757d; }
 
 /* course.less */
 /* COURSE CONTENT */
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 02bf13eacb4..09bd1a770b7 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -12852,7 +12852,7 @@ table.calendartable caption {
     margin: 0; }
 
 .cal_courses_flt {
-  color: #868e96; }
+  color: #6c757d; }
 
 /* course.less */
 /* COURSE CONTENT */