diff --git a/cmake/Install.cmake b/cmake/Install.cmake
index 6615e17fc..5499aeb37 100644
--- a/cmake/Install.cmake
+++ b/cmake/Install.cmake
@@ -40,6 +40,16 @@ set(extra_confdir
     "${datadir}/${rel_confdir}"
     CACHE STRING "Path for extra configuration")
 
+
+corrosion_set_env_vars(${fish_rust_target}
+    "PREFIX=${prefix}"
+    # Temporary hack to propogate CMake flags/options to build.rs.
+    "CMAKE_WITH_GETTEXT=${CMAKE_WITH_GETTEXT}"
+    "DOCDIR=${CMAKE_INSTALL_FULL_DOCDIR}"
+    "DATADIR=${CMAKE_INSTALL_FULL_DATADIR}"
+    "SYSCONFDIR=${CMAKE_INSTALL_FULL_SYSCONFDIR}"
+    "BINDIR=${CMAKE_INSTALL_FULL_BINDIR}"
+)
 # These are the man pages that go in system manpath; all manpages go in the fish-specific manpath.
 set(MANUALS ${CMAKE_CURRENT_BINARY_DIR}/user_doc/man/man1/fish.1
             ${CMAKE_CURRENT_BINARY_DIR}/user_doc/man/man1/fish_indent.1
diff --git a/cmake/Rust.cmake b/cmake/Rust.cmake
index cf6ae29bb..c87cd1917 100644
--- a/cmake/Rust.cmake
+++ b/cmake/Rust.cmake
@@ -67,10 +67,10 @@ corrosion_set_env_vars(${fish_rust_target}
     "PREFIX=${CMAKE_INSTALL_PREFIX}"
     # Temporary hack to propogate CMake flags/options to build.rs.
     "CMAKE_WITH_GETTEXT=${CMAKE_WITH_GETTEXT}"
-    "DOCDIR=${DOCDIR}"
-    "DATADIR=${DATADIR}"
-    "SYSCONFDIR=${SYSCONFDIR}"
-    "BINDIR=${BINDIR}"
+    "DOCDIR=${CMAKE_INSTALL_FULL_DOCDIR}"
+    "DATADIR=${CMAKE_INSTALL_FULL_DATADIR}"
+    "SYSCONFDIR=${CMAKE_INSTALL_FULL_SYSCONFDIR}"
+    "BINDIR=${CMAKE_INSTALL_FULL_BINDIR}"
 )
 
 # this needs an extra fish-rust due to the poor source placement