diff --git a/cmake/modules/Findmodp_b64.cmake b/cmake/modules/Findmodp_b64.cmake
index 65ab8aee2..bce609790 100644
--- a/cmake/modules/Findmodp_b64.cmake
+++ b/cmake/modules/Findmodp_b64.cmake
@@ -9,7 +9,7 @@ find_library(modp_b64_DEBUG_LIBRARIES
 
 # vcpkg specific locations for debug libraries if they are not already found
 set(modpbase64SavePrefixPath ${CMAKE_PREFIX_PATH})
-list(FILTER CMAKE_PREFIX_PATH INCLUDE REGEX "/debug")
+list(FILTER CMAKE_PREFIX_PATH INCLUDE REGEX "/debug$")
 find_library(modp_b64_DEBUG_LIBRARIES
   NAMES
   modpbase64
@@ -18,7 +18,7 @@ find_library(modp_b64_DEBUG_LIBRARIES
 set(CMAKE_PREFIX_PATH ${modpbase64SavePrefixPath})
 
 set(modpbase64SavePrefixPath ${CMAKE_PREFIX_PATH})
-list(FILTER CMAKE_PREFIX_PATH EXCLUDE REGEX "/debug")
+list(FILTER CMAKE_PREFIX_PATH EXCLUDE REGEX "/debug$")
 find_library(modp_b64_LIBRARIES NAMES modpbase64 libmodpbase64)
 set(CMAKE_PREFIX_PATH ${modpbase64SavePrefixPath})