diff --git a/CHANGES.md b/CHANGES.md
index 5e8db3c7..9da53701 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,7 @@
   management and fix potential double-free bugs.
 - Updated configure script to look for zlib with pkg-config (Issue #519)
 - Updated markdown support code to mmd.
+- Fixed handling of whitespace-only nodes (Issue #528)
 
 
 # Changes in HTMLDOC v1.9.18
diff --git a/htmldoc/ps-pdf.cxx b/htmldoc/ps-pdf.cxx
index b6ae8035..9ad44ebb 100644
--- a/htmldoc/ps-pdf.cxx
+++ b/htmldoc/ps-pdf.cxx
@@ -5201,7 +5201,7 @@ parse_paragraph(tree_t *t,	/* I - Tree to parse */
       if (temp->markup != MARKUP_A)
         break;
 
-    if (temp != NULL && temp->markup == MARKUP_NONE && temp->data[0] == ' ')
+    if (temp != NULL && temp->markup == MARKUP_NONE && temp->data[0] == ' ' && temp->data[1])
     {
       // Drop leading space...
       for (dataptr = temp->data; *dataptr; dataptr ++)