diff --git a/modules/cfgutils/README b/modules/cfgutils/README
index efb8bf15307..60c81beeb85 100644
--- a/modules/cfgutils/README
+++ b/modules/cfgutils/README
@@ -738,7 +738,7 @@ if(shuffle_avps( $avp(foo) ))
    Example 1.27. async sleep usage
 {
 ...
-async( sleep("5"), after_sleep );
+async( sleep(5), after_sleep );
 }
 
 route[after_sleep] {
@@ -759,7 +759,7 @@ route[after_sleep] {
    Example 1.28. async usleep usage
 {
 ...
-async( usleep("1000"), after_usleep );
+async( usleep(1000), after_usleep );
 }
 
 route[after_usleep] {
diff --git a/modules/cfgutils/README.md b/modules/cfgutils/README.md
index ce00749223e..d406fe5797c 100644
--- a/modules/cfgutils/README.md
+++ b/modules/cfgutils/README.md
@@ -800,7 +800,7 @@ online Manual.
 ```opensips title="async sleep usage"
 {
 ...
-async( sleep("5"), after_sleep );
+async( sleep(5), after_sleep );
 }
 
 route[after_sleep] {
@@ -827,7 +827,7 @@ online Manual.
 ```opensips title="async usleep usage"
 {
 ...
-async( usleep("1000"), after_usleep );
+async( usleep(1000), after_usleep );
 }
 
 route[after_usleep] {
diff --git a/modules/cfgutils/doc/cfgutils_admin.xml b/modules/cfgutils/doc/cfgutils_admin.xml
index 9e65effe64f..5a7fcd84f31 100644
--- a/modules/cfgutils/doc/cfgutils_admin.xml
+++ b/modules/cfgutils/doc/cfgutils_admin.xml
@@ -908,7 +908,7 @@ if(shuffle_avps( $avp(foo) ))
 		<programlisting format="linespecific">
 {
 ...
-async( sleep("5"), after_sleep );
+async( sleep(5), after_sleep );
 }
 
 route[after_sleep] {
@@ -939,7 +939,7 @@ route[after_sleep] {
 		<programlisting format="linespecific">
 {
 ...
-async( usleep("1000"), after_usleep );
+async( usleep(1000), after_usleep );
 }
 
 route[after_usleep] {