diff --git a/NifSkope.pro b/NifSkope.pro
index 1c0bc5a..cc29fc5 100644
--- a/NifSkope.pro
+++ b/NifSkope.pro
@@ -330,14 +330,14 @@ nvtristrip {
 }
 
 qhull {
-    !*msvc*:QMAKE_CFLAGS += -isystem ../nifskope/lib/qhull/src
-    !*msvc*:QMAKE_CXXFLAGS += -isystem ../nifskope/lib/qhull/src
+    !*msvc*:QMAKE_CFLAGS += -isystem ./lib/qhull/src
+    !*msvc*:QMAKE_CXXFLAGS += -isystem ./lib/qhull/src
     else:INCLUDEPATH += lib/qhull/src
     HEADERS += $$files($$PWD/lib/qhull/src/libqhull/*.h, false)
 }
 
 gli {
-    !*msvc*:QMAKE_CXXFLAGS += -isystem ../nifskope/lib/gli/gli -isystem ../nifskope/lib/gli/external
+    !*msvc*:QMAKE_CXXFLAGS += -isystem ./lib/gli/gli -isystem ./lib/gli/external
     else:INCLUDEPATH += lib/gli/gli lib/gli/external
     HEADERS += $$files($$PWD/lib/gli/gli/*.hpp, true)
     HEADERS += $$files($$PWD/lib/gli/gli/*.inl, true)
@@ -346,8 +346,8 @@ gli {
 }
 
 zlib {
-    !*msvc*:QMAKE_CFLAGS += -isystem ../nifskope/lib/zlib
-    !*msvc*:QMAKE_CXXFLAGS += -isystem ../nifskope/lib/zlib
+    !*msvc*:QMAKE_CFLAGS += -isystem ./lib/zlib
+    !*msvc*:QMAKE_CXXFLAGS += -isystem ./lib/zlib
     else:INCLUDEPATH += lib/zlib
     HEADERS += $$files($$PWD/lib/zlib/*.h, false)
     SOURCES += $$files($$PWD/lib/zlib/*.c, false)