diff --git a/lang/cem/ctest/READ_ME b/lang/cem/ctest/READ_ME
index a36d2786a..67cfa93eb 100644
--- a/lang/cem/ctest/READ_ME
+++ b/lang/cem/ctest/READ_ME
@@ -2,7 +2,7 @@ To run this test, set the CEM variable to the compilation command,
 and the RUN variable to the run command (name of the interpreter or empty).
 For instance:
 
-	CEM=acc -mem24; export CEM
+	CEM="acc -mem24"; export CEM
 	RUN=em; export RUN
 
 Then type: sh run > out 2>&1 &