diff --git a/CMakeLists.txt b/CMakeLists.txt
index 477de26b2..b02b305b8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ message(STATUS "Finding test data files in directory ${TEST_FILE_DIR}.")
 set(MASTER_TABLE_DIR "${CMAKE_INSTALL_PREFIX}/tables" CACHE STRING "Installation location of Master BUFR Tables")
 
 string(LENGTH "${MASTER_TABLE_DIR}" _lenmtd)
-set(_lenslmax 120)  # max number of chars of ${MASTER_TABLE_DIR} to store on a single line of a Fortran90 or C source code file
+set(_lenslmax 60)  # max number of chars of ${MASTER_TABLE_DIR} to store on a single line of a Fortran90 or C source code file
 if(${_lenmtd} LESS_EQUAL ${_lenslmax})
   set(MASTER_TABLE_DIR_F "${MASTER_TABLE_DIR}")
   set(MASTER_TABLE_DIR_C "${MASTER_TABLE_DIR}")