diff --git a/ThirdParty/iphreeqc/CMakeLists.txt b/ThirdParty/iphreeqc/CMakeLists.txt
index 0c27927e06041c63b52665a8411236e829dd7594..7b1e61d53c418f782adb66cac7581d17198a3c99 100644
--- a/ThirdParty/iphreeqc/CMakeLists.txt
+++ b/ThirdParty/iphreeqc/CMakeLists.txt
@@ -99,7 +99,6 @@ target_include_directories(iphreeqc BEFORE
     ${CMAKE_CURRENT_SOURCE_DIR}/src/src
     ${CMAKE_CURRENT_SOURCE_DIR}/src/src/phreeqcpp
 )
-set_target_properties(iphreeqc PROPERTIES CXX_STANDARD 14)
 # Exclude iphreeqc target from clang-tidy tests because it handles the above
 # mentioned 'src/src/Var.c' file as c, not c++.
 set_target_properties(iphreeqc PROPERTIES CXX_CLANG_TIDY "")