diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 8e70c46..e985789 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -10,6 +10,14 @@
     set(MBEDTLS_DIR ${CMAKE_SOURCE_DIR})
 endif()
 
+# If set, make MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE into PATHs
+if(DEFINED MBEDTLS_CONFIG_FILE)
+    set(MBEDTLS_CONFIG_FILE "" CACHE PATH "Mbed TLS config file (overrides default).")
+endif()
+if(DEFINED MBEDTLS_USER_CONFIG_FILE)
+    set(MBEDTLS_USER_CONFIG_FILE "" CACHE PATH "Mbed TLS user config file (appended to default).")
+endif()
+
 set(src_crypto
     aes.c
     aesni.c
@@ -320,6 +328,15 @@
         PUBLIC $<BUILD_INTERFACE:${MBEDTLS_DIR}/include/>
                $<INSTALL_INTERFACE:include/>
         PRIVATE ${MBEDTLS_DIR}/library/)
+    # Pass-through MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE
+    if(DEFINED MBEDTLS_CONFIG_FILE)
+        target_compile_definitions(${target}
+            PUBLIC MBEDTLS_CONFIG_FILE="${MBEDTLS_CONFIG_FILE}")
+    endif()
+    if(DEFINED MBEDTLS_USER_CONFIG_FILE)
+        target_compile_definitions(${target}
+            PUBLIC MBEDTLS_USER_CONFIG_FILE="${MBEDTLS_USER_CONFIG_FILE}")
+    endif()
     install(
         TARGETS ${target}
         EXPORT MbedTLSTargets