diff --git a/unittest/libmariadb/CMakeLists.txt b/unittest/libmariadb/CMakeLists.txt
index 086f0416..8cdcdc76 100644
--- a/unittest/libmariadb/CMakeLists.txt
+++ b/unittest/libmariadb/CMakeLists.txt
@@ -25,9 +25,9 @@ ADD_DEFINITIONS(-DLIBMARIADB)
 EXECUTE_PROCESS(COMMAND openssl x509 -in server-cert.pem -sha1 -fingerprint -noout
                 WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/unittest/libmariadb/certs
                 OUTPUT_VARIABLE FINGER_PRINT)
-STRING(REPLACE "SHA1 Fingerprint=" "" FINGER_PRINT ${FINGER_PRINT})
-STRING(REPLACE "\n" "" FINGER_PRINT ${FINGER_PRINT})
-STRING(REPLACE ":" "" SSL_CERT_FINGER_PRINT ${FINGER_PRINT})
+STRING(REPLACE "SHA1 Fingerprint=" "" FINGER_PRINT "${FINGER_PRINT}")
+STRING(REPLACE "\n" "" FINGER_PRINT "${FINGER_PRINT}")
+STRING(REPLACE ":" "" SSL_CERT_FINGER_PRINT "${FINGER_PRINT}")
 MESSAGE(STATUS "FINGER_PRINT ${SSL_CERT_FINGER_PRINT}")
 
 CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/unittest/libmariadb/ssl.c.in