diff --git a/share/live/x86.tmpl b/share/live/x86.tmpl
index 522c873b..eb67bbf0 100644
--- a/share/live/x86.tmpl
+++ b/share/live/x86.tmpl
@@ -6,6 +6,9 @@ PXEBOOTDIR="images/pxeboot"
 BOOTDIR="isolinux"
 KERNELDIR=PXEBOOTDIR
 LIVEDIR="LiveOS"
+
+## Don't allow spaces or escape characters in the iso label
+isolabel = ''.join(ch if ch.isalnum() else '-' for ch in isolabel)
 %>
 
 mkdir ${LIVEDIR}
diff --git a/share/x86.tmpl b/share/x86.tmpl
index a139596f..cdd74776 100644
--- a/share/x86.tmpl
+++ b/share/x86.tmpl
@@ -6,6 +6,9 @@ PXEBOOTDIR="images/pxeboot"
 BOOTDIR="isolinux"
 KERNELDIR=PXEBOOTDIR
 LIVEDIR="LiveOS"
+
+## Don't allow spaces or escape characters in the iso label
+isolabel = ''.join(ch if ch.isalnum() else '-' for ch in isolabel)
 %>
 
 mkdir ${LIVEDIR}
diff --git a/src/pylorax/__init__.py b/src/pylorax/__init__.py
index 952f08f8..83f5286d 100644
--- a/src/pylorax/__init__.py
+++ b/src/pylorax/__init__.py
@@ -242,7 +242,7 @@ class Lorax(BaseLoraxClass):
 
         # NOTE: if you change isolabel, you need to change pungi to match, or
         # the pungi images won't boot.
-        isolabel = volid or "{0.name} {0.version} {1.basearch}".format(self.product,
+        isolabel = volid or "{0.name}-{0.version}-{1.basearch}".format(self.product,
                                                                        self.arch)
 
         if len(isolabel) > 32:
diff --git a/src/sbin/livemedia-creator b/src/sbin/livemedia-creator
index 47eec2ce..e5f4f77a 100755
--- a/src/sbin/livemedia-creator
+++ b/src/sbin/livemedia-creator
@@ -557,7 +557,7 @@ def make_livecd(opts, mount_dir, work_dir):
         remove(fullpath)
     shutil.copytree(configdir, fullpath)
 
-    isolabel = opts.volid or "{0.name} {0.version} {1.basearch}".format(product, arch)
+    isolabel = opts.volid or "{0.name}-{0.version}-{1.basearch}".format(product, arch)
     if len(isolabel) > 32:
         isolabel = isolabel[:32]
         log.warn("Truncating isolabel to 32 chars: %s", isolabel)