diff --git a/src/travis/windows-x86-before-install.sh b/src/travis/windows-x86-before-install.sh
index 461c86aa..c515955f 100755
--- a/src/travis/windows-x86-before-install.sh
+++ b/src/travis/windows-x86-before-install.sh
@@ -11,6 +11,8 @@ export PATH=$PATH:/c/python/scripts
 cd $mypath
 export python=/c/python/python.exe
 export pip=/c/python/scripts/pip.exe
+until [ -f $python ]; do :; done
+until [ -f $pip ]; do :; done
 
 $pip install --upgrade pip
 $pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 $pip install -U
diff --git a/src/travis/windows-x86_64-before-install.sh b/src/travis/windows-x86_64-before-install.sh
index 3135f0dc..d69fbae8 100755
--- a/src/travis/windows-x86_64-before-install.sh
+++ b/src/travis/windows-x86_64-before-install.sh
@@ -21,6 +21,8 @@ export PATH=$PATH:/c/python/scripts
 cd $mypath
 export python=/c/python/python.exe
 export pip=/c/python/scripts/pip.exe
+until [ -f $python ]; do :; done
+until [ -f $pip ]; do :; done
 
 $pip install --upgrade pip
 $pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 $pip install -U