diff --git a/mkspecs/features/toolchain.prf b/mkspecs/features/toolchain.prf
index 6039c52bd08..55295f271f4 100644
--- a/mkspecs/features/toolchain.prf
+++ b/mkspecs/features/toolchain.prf
@@ -134,6 +134,8 @@ isEmpty($${target_prefix}.INCDIRS) {
             for (line, output) {
                 contains(line, "^libraries: .*") {
                     line ~= s,^libraries: ,,
+                    # clang (7.x) on Windows uses the wrong path list separator ...
+                    equals(QMAKE_HOST.os, Windows): line ~= s,:(?![/\\\\]),;,
                     paths = $$split(line, $$QMAKE_DIRLIST_SEP)
                     for (path, paths): \
                         QMAKE_DEFAULT_LIBDIRS += $$clean_path($$replace(path, ^=, $$[SYSROOT]))