diff --git a/qmake/generators/unix/unixmake.cpp b/qmake/generators/unix/unixmake.cpp
index 723eea80d31..c4750cb8a49 100644
--- a/qmake/generators/unix/unixmake.cpp
+++ b/qmake/generators/unix/unixmake.cpp
@@ -612,7 +612,7 @@ UnixMakefileGenerator::processPrlFiles()
             ProStringList &prl_libs = project->values("QMAKE_CURRENT_PRL_LIBS");
             if(!prl_libs.isEmpty()) {
                 for(int prl = 0; prl < prl_libs.size(); ++prl)
-                    l.insert(lit+prl+1, prl_libs.at(prl).toQString());
+                    l.insert(++lit, prl_libs.at(prl));
                 prl_libs.clear();
             }
         }
diff --git a/qmake/generators/win32/winmakefile.cpp b/qmake/generators/win32/winmakefile.cpp
index 46a05c52b2d..386e2865fa3 100644
--- a/qmake/generators/win32/winmakefile.cpp
+++ b/qmake/generators/win32/winmakefile.cpp
@@ -234,7 +234,7 @@ Win32MakefileGenerator::processPrlFiles()
             }
             ProStringList &prl_libs = project->values("QMAKE_CURRENT_PRL_LIBS");
             for (int prl = 0; prl < prl_libs.size(); ++prl)
-                l.insert(lit + prl + 1, prl_libs.at(prl));
+                l.insert(++lit, prl_libs.at(prl));
             prl_libs.clear();
         }