diff --git i/src/lib/CMakeLists.txt w/src/lib/CMakeLists.txt
index 086ac57d..2ce59ca1 100755
--- i/src/lib/CMakeLists.txt
+++ w/src/lib/CMakeLists.txt
@@ -328,7 +328,7 @@ elseif (CRYPTO_BACKEND_OPENSSL)
   target_link_libraries(librnp-obj PRIVATE OpenSSL::Crypto)
 endif()

-target_link_libraries(librnp-obj PRIVATE sexp)
+target_link_libraries(librnp-obj PRIVATE sexpp)

 set_target_properties(librnp-obj PROPERTIES CXX_VISIBILITY_PRESET hidden)
 if (TARGET BZip2::BZip2)
@@ -384,7 +384,7 @@ foreach (prop LINK_LIBRARIES INTERFACE_LINK_LIBRARIES INCLUDE_DIRECTORIES INTERF
   get_target_property(val librnp-obj ${prop})
   if (BUILD_SHARED_LIBS)
     set_property(TARGET librnp-static PROPERTY ${prop} ${val})
-    list(REMOVE_ITEM val "$<LINK_ONLY:sexp>")
+    list(REMOVE_ITEM val "$<LINK_ONLY:sexpp>")
     set_property(TARGET librnp PROPERTY ${prop} ${val})
   else()
     set_property(TARGET librnp PROPERTY ${prop} ${val})
diff --git i/src/librekey/g23_sexp.hpp w/src/librekey/g23_sexp.hpp
index b888680f..b062c52f 100644
--- i/src/librekey/g23_sexp.hpp
+++ w/src/librekey/g23_sexp.hpp
@@ -27,8 +27,8 @@
 #ifndef RNP_G23_SEXP_HPP
 #define RNP_G23_SEXP_HPP

-#include "sexp/sexp.h"
-#include "sexp/ext-key-format.h"
+#include "sexpp/sexp.h"
+#include "sexpp/ext-key-format.h"

 #define SXP_MAX_DEPTH 30

diff --git i/src/tests/CMakeLists.txt w/src/tests/CMakeLists.txt
index 7d2a6b0c..88aeaf9f 100644
--- i/src/tests/CMakeLists.txt
+++ w/src/tests/CMakeLists.txt
@@ -176,7 +176,7 @@ target_link_libraries(rnp_tests
   PRIVATE
     librnp-static
     JSON-C::JSON-C
-    sexp
+    sexpp
     ${GTestMain}
 )
 if (CRYPTO_BACKEND_LOWERCASE STREQUAL "openssl")