diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+# 1.8.0
+
+* `cp_r` now uses upper case R: `cp -R`
+
 # 1.7.2
 
 * Support exceptions-0.9
diff --git a/shelly.cabal b/shelly.cabal
--- a/shelly.cabal
+++ b/shelly.cabal
@@ -1,6 +1,6 @@
 Name:       shelly
 
-Version:     1.7.2
+Version:     1.8.0
 Synopsis:    shell-like (systems) programming in Haskell
 
 Description: Shelly provides convenient systems programming in Haskell,
diff --git a/src/Shelly.hs b/src/Shelly.hs
--- a/src/Shelly.hs
+++ b/src/Shelly.hs
@@ -1399,7 +1399,7 @@
     from <- absPath from'
     fromIsDir <- (test_d from)
     if not fromIsDir then cp from' to' else do
-       trace $ "cp -r " <> toTextIgnore from <> " " <> toTextIgnore to'
+       trace $ "cp -R " <> toTextIgnore from <> " " <> toTextIgnore to'
        to <- absPath to'
        toIsDir <- test_d to