diff --git a/testssl.sh b/testssl.sh
index 04b2cf4..02d246b 100755
--- a/testssl.sh
+++ b/testssl.sh
@@ -90,7 +90,7 @@
      SWURL="https://testssl.sh/    "
 
 readonly PROG_NAME=$(basename "$0")
-readonly RUN_DIR=$(dirname "$0")
+readonly RUN_DIR=$(dirname "$(readlink -e $0)")
 TESTSSL_INSTALL_DIR="${TESTSSL_INSTALL_DIR:-""}"   # if you run testssl.sh from a different path you can set either TESTSSL_INSTALL_DIR
 CA_BUNDLES_PATH="${CA_BUNDLES_PATH:-""}"           # or CA_BUNDLES_PATH to find the CA BUNDLES. TESTSSL_INSTALL_DIR helps you to find the RFC mapping also
 CIPHERS_BY_STRENGTH_FILE=""
@@ -9442,7 +9442,7 @@
 # TESTSSL_INSTALL_DIR can be supplied via environment so that the cipher mapping and CA bundles can be found
 # www.carbonwind.net/TLS_Cipher_Suites_Project/tls_ssl_cipher_suites_simple_table_all.htm
 get_install_dir() {
-     [[ -z "$TESTSSL_INSTALL_DIR" ]] && TESTSSL_INSTALL_DIR="$(dirname ${BASH_SOURCE[0]})"
+     [[ -z "$TESTSSL_INSTALL_DIR" ]] && TESTSSL_INSTALL_DIR="$(dirname "$(readlink -e ${BASH_SOURCE[0]})")"
 
      [[ -r "$RUN_DIR/etc/cipher-mapping.txt" ]] && CIPHERS_BY_STRENGTH_FILE="$RUN_DIR/etc/cipher-mapping.txt"
      [[ -r "$TESTSSL_INSTALL_DIR/etc/cipher-mapping.txt" ]] && CIPHERS_BY_STRENGTH_FILE="$TESTSSL_INSTALL_DIR/etc/cipher-mapping.txt"