diff --git a/src/backend/xml/sixtp.c b/src/backend/xml/sixtp.c
index 2169a3d0b8..561e804cf5 100644
--- a/src/backend/xml/sixtp.c
+++ b/src/backend/xml/sixtp.c
@@ -29,6 +29,9 @@
 #include <ctype.h>
 #include <stdarg.h>
 #include <sys/types.h>
+#ifdef _MSC_VER
+typedef int ssize_t;
+#endif
 
 #include "sixtp.h"
 #include "sixtp-parsers.h"
diff --git a/src/engine/gnc-filepath-utils.c b/src/engine/gnc-filepath-utils.c
index f15e9ed2b4..e3ea2a602f 100644
--- a/src/engine/gnc-filepath-utils.c
+++ b/src/engine/gnc-filepath-utils.c
@@ -50,6 +50,11 @@
 #include "gnc-engine.h"
 #include "gnc-filepath-utils.h"
 
+#ifdef _MSC_VER
+#include <glib/gwin32.h>
+#define PATH_MAX MAXPATHLEN
+#endif
+
 static QofLogModule log_module = GNC_MOD_BACKEND;
 
 
diff --git a/src/libqof/qof/gnc-numeric.c b/src/libqof/qof/gnc-numeric.c
index 30ab45b3d9..302560a586 100644
--- a/src/libqof/qof/gnc-numeric.c
+++ b/src/libqof/qof/gnc-numeric.c
@@ -1147,6 +1147,10 @@ gnc_numeric_to_decimal(gnc_numeric *a, guint8 *max_decimal_places)
  *  double_to_gnc_numeric
  ********************************************************************/
 
+#ifdef _MSC_VER
+# define rint /* */
+#endif
+
 gnc_numeric
 double_to_gnc_numeric(double in, gint64 denom, gint how)
 {
diff --git a/src/libqof/qof/kvp_frame.c b/src/libqof/qof/kvp_frame.c
index 8c22069f51..69afd4c664 100644
--- a/src/libqof/qof/kvp_frame.c
+++ b/src/libqof/qof/kvp_frame.c
@@ -1512,6 +1512,9 @@ kvp_frame_for_each_slot(KvpFrame *f,
     g_hash_table_foreach(f->hash, (GHFunc) proc, data);
 }
 
+#ifdef _MSC_VER
+# define isnan _isnan
+#endif
 gint
 double_compare(double d1, double d2)
 {