diff --git a/src/ShellCheck/Checks/ShellSupport.hs b/src/ShellCheck/Checks/ShellSupport.hs
index cab0546..9192c0e 100644
--- a/src/ShellCheck/Checks/ShellSupport.hs
+++ b/src/ShellCheck/Checks/ShellSupport.hs
@@ -212,6 +212,8 @@ prop_checkBashisms118 = verify checkBashisms "#!/bin/busybox sh\nxyz=1\n${!x*}"
 prop_checkBashisms119 = verify checkBashisms "#!/bin/busybox sh\nx='test'\n${x^^[t]}" -- SC3059
 prop_checkBashisms120 = verify checkBashisms "#!/bin/sh\n[ x == y ]"
 prop_checkBashisms121 = verifyNot checkBashisms "#!/bin/sh\n# shellcheck shell=busybox\n[ x == y ]"
+prop_checkBashisms122 = verify checkBashisms "#!/bin/dash\n$'a'"
+prop_checkBashisms123 = verifyNot checkBashisms "#!/bin/busybox sh\n$'a'"
 checkBashisms = ForShell [Sh, Dash, BusyboxSh] $ \t -> do
     params <- ask
     kludge params t
@@ -229,7 +231,8 @@ checkBashisms = ForShell [Sh, Dash, BusyboxSh] $ \t -> do
 
     bashism (T_ProcSub id _ _) = warnMsg id 3001 "process substitution is"
     bashism (T_Extglob id _ _) = warnMsg id 3002 "extglob is"
-    bashism (T_DollarSingleQuoted id _) = warnMsg id 3003 "$'..' is"
+    bashism (T_DollarSingleQuoted id _) =
+        unless isBusyboxSh $ warnMsg id 3003 "$'..' is"
     bashism (T_DollarDoubleQuoted id _) = warnMsg id 3004 "$\"..\" is"
     bashism (T_ForArithmetic id _ _ _ _) = warnMsg id 3005 "arithmetic for loops are"
     bashism (T_Arithmetic id _) = warnMsg id 3006 "standalone ((..)) is"