diff --git a/src/modules/sprintf/testsuite.in b/src/modules/sprintf/testsuite.in
index 1ced592cf4ff2f1f819bb715723abbb93bf671e2..cb17979af2d684f43a425ad71f1a8c74b42b34d1 100644
--- a/src/modules/sprintf/testsuite.in
+++ b/src/modules/sprintf/testsuite.in
@@ -27,6 +27,7 @@ test_eq(sprintf("%{%d\n%}",({1,2,3,4})),"1\n2\n3\n4\n")
 test_eq(strlen(sprintf("%1000s","")),1000)
 test_eq(sprintf("%2d",1)," 1")
 test_eq(sprintf("%2d",1)," 1")
+test_eq(sprintf("foo_%3d",1),"foo_  1")
 test_eq(sprintf("%2d",2222),"2222")
 test_eq(sprintf("%!2d",2222),"22")
 test_eq(sprintf("%!!2d",2222),"2222")