diff --git a/com.oracle.truffle.r.release/src/R_legacy b/com.oracle.truffle.r.release/src/R_legacy
index e26c7151e01ec416b53152e906abdd02284793b0..99ecc9d7f87c7fa1ae977e098e93122bcda923bb 100755
--- a/com.oracle.truffle.r.release/src/R_legacy
+++ b/com.oracle.truffle.r.release/src/R_legacy
@@ -36,7 +36,7 @@ done
 JAVA_HOME="$( dirname "$JRE" )"
 
 GRAALVMCP=""
-TMPCP="%%GRAALVMCP"
+TMPCP="jre/lib/truffle/truffle-api.jar:jre/languages/R/fastr.jar"
 for cp in ${TMPCP//:/ }
 do
     GRAALVMCP="$GRAALVMCP$JAVA_HOME/$cp:"
diff --git a/com.oracle.truffle.r.release/src/Rscript_legacy b/com.oracle.truffle.r.release/src/Rscript_legacy
index 3f088fad5007258dbd8250e089e35b0c258cbbd9..0f0a61f602646dc3faefa6e2232344d3d0788126 100755
--- a/com.oracle.truffle.r.release/src/Rscript_legacy
+++ b/com.oracle.truffle.r.release/src/Rscript_legacy
@@ -36,7 +36,7 @@ done
 JAVA_HOME="$( dirname "$JRE" )"
 
 GRAALVMCP=""
-TMPCP="%%GRAALVMCP"
+TMPCP="jre/lib/truffle/truffle-api.jar:jre/languages/R/fastr.jar"
 for cp in ${TMPCP//:/ }
 do
     GRAALVMCP="$GRAALVMCP$JAVA_HOME/$cp:"