diff --git a/configure.ac b/configure.ac
index 2f833244..e37b4dbf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -564,6 +564,39 @@ then
 
 fi
 
+# Glyph callback variants
+if test "x${have_freerdp2}" = "xyes"
+then
+
+    # FreeRDP 2.0.0-rc3 and older used UINT32 for integer parameters to all
+    # rdpGlyph callbacks
+    AC_MSG_CHECKING([whether rdpGlyph callbacks accept INT32 integer parameters])
+    AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+
+        #include <freerdp/freerdp.h>
+        #include <freerdp/graphics.h>
+        #include <winpr/wtypes.h>
+
+        BOOL test_begindraw(rdpContext* context, INT32 x, INT32 y,
+                INT32 width, INT32 height, UINT32 fgcolor, UINT32 bgcolor,
+                BOOL redundant);
+
+        rdpGlyph glyph = {
+            .BeginDraw = test_begindraw
+        };
+
+        int main() {
+            return (int) glyph.BeginDraw(NULL, 0, 0, 0, 0, 0, 0, FALSE);
+        }
+
+    ]])],
+    [AC_MSG_RESULT([yes])]
+    [AC_DEFINE([FREERDP_GLYPH_CALLBACKS_ACCEPT_INT32],,
+               [Whether rdpGlyph callbacks accept INT32 integer parameters])],
+    [AC_MSG_RESULT([no])])
+
+fi
+
 AM_CONDITIONAL([ENABLE_RDP], [test "x${have_freerdp2}" = "xyes"])
 
 #
diff --git a/src/protocols/rdp/glyph.c b/src/protocols/rdp/glyph.c
index cecaa8d9..d8413841 100644
--- a/src/protocols/rdp/glyph.c
+++ b/src/protocols/rdp/glyph.c
@@ -91,7 +91,9 @@ BOOL guac_rdp_glyph_new(rdpContext* context, const rdpGlyph* glyph) {
 }
 
 BOOL guac_rdp_glyph_draw(rdpContext* context, const rdpGlyph* glyph,
-        INT32 x, INT32 y, INT32 w, INT32 h, INT32 sx, INT32 sy,
+        GLYPH_CALLBACK_INT32 x, GLYPH_CALLBACK_INT32 y,
+        GLYPH_CALLBACK_INT32 w, GLYPH_CALLBACK_INT32 h,
+        GLYPH_CALLBACK_INT32 sx, GLYPH_CALLBACK_INT32 sy,
         BOOL redundant) {
 
     guac_client* client = ((rdp_freerdp_context*) context)->client;
@@ -127,9 +129,10 @@ void guac_rdp_glyph_free(rdpContext* context, rdpGlyph* glyph) {
 
 }
 
-BOOL guac_rdp_glyph_begindraw(rdpContext* context, INT32 x, INT32 y,
-        INT32 width, INT32 height, UINT32 fgcolor, UINT32 bgcolor,
-        BOOL redundant) {
+BOOL guac_rdp_glyph_begindraw(rdpContext* context,
+        GLYPH_CALLBACK_INT32 x, GLYPH_CALLBACK_INT32 y,
+        GLYPH_CALLBACK_INT32 width, GLYPH_CALLBACK_INT32 height,
+        UINT32 fgcolor, UINT32 bgcolor, BOOL redundant) {
 
     guac_client* client = ((rdp_freerdp_context*) context)->client;
     guac_rdp_client* rdp_client =
@@ -157,8 +160,10 @@ BOOL guac_rdp_glyph_begindraw(rdpContext* context, INT32 x, INT32 y,
 
 }
 
-BOOL guac_rdp_glyph_enddraw(rdpContext* context, INT32 x, INT32 y,
-        INT32 width, INT32 height, UINT32 fgcolor, UINT32 bgcolor) {
+BOOL guac_rdp_glyph_enddraw(rdpContext* context,
+        GLYPH_CALLBACK_INT32 x, GLYPH_CALLBACK_INT32 y,
+        GLYPH_CALLBACK_INT32 width, GLYPH_CALLBACK_INT32 height,
+        UINT32 fgcolor, UINT32 bgcolor) {
     /* IGNORE */
     return TRUE;
 }
diff --git a/src/protocols/rdp/glyph.h b/src/protocols/rdp/glyph.h
index 1e9b389b..85f2080d 100644
--- a/src/protocols/rdp/glyph.h
+++ b/src/protocols/rdp/glyph.h
@@ -20,11 +20,27 @@
 #ifndef GUAC_RDP_GLYPH_H
 #define GUAC_RDP_GLYPH_H
 
+#include "config.h"
+
 #include <cairo/cairo.h>
 #include <freerdp/freerdp.h>
 #include <freerdp/graphics.h>
 #include <winpr/wtypes.h>
 
+#ifdef FREERDP_GLYPH_CALLBACKS_ACCEPT_INT32
+/**
+ * FreeRDP 2.0.0-rc4 and newer requires INT32 for all integer arguments of
+ * glyph callbacks.
+ */
+#define GLYPH_CALLBACK_INT32 INT32
+#else
+/**
+ * FreeRDP 2.0.0-rc3 and older requires UINT32 for all integer arguments of
+ * glyph callbacks.
+ */
+#define GLYPH_CALLBACK_INT32 UINT32
+#endif
+
 /**
  * Guacamole-specific rdpGlyph data.
  */
@@ -94,7 +110,9 @@ BOOL guac_rdp_glyph_new(rdpContext* context, const rdpGlyph* glyph);
  *     TRUE if successful, FALSE otherwise.
  */
 BOOL guac_rdp_glyph_draw(rdpContext* context, const rdpGlyph* glyph,
-        INT32 x, INT32 y, INT32 w, INT32 h, INT32 sx, INT32 sy,
+        GLYPH_CALLBACK_INT32 x, GLYPH_CALLBACK_INT32 y,
+        GLYPH_CALLBACK_INT32 w, GLYPH_CALLBACK_INT32 h,
+        GLYPH_CALLBACK_INT32 sx, GLYPH_CALLBACK_INT32 sy,
         BOOL redundant);
 
 /**
@@ -150,9 +168,10 @@ void guac_rdp_glyph_free(rdpContext* context, rdpGlyph* glyph);
  * @return
  *     TRUE if successful, FALSE otherwise.
  */
-BOOL guac_rdp_glyph_begindraw(rdpContext* context, INT32 x, INT32 y,
-        INT32 width, INT32 height, UINT32 fgcolor, UINT32 bgcolor,
-        BOOL redundant);
+BOOL guac_rdp_glyph_begindraw(rdpContext* context,
+        GLYPH_CALLBACK_INT32 x, GLYPH_CALLBACK_INT32 y,
+        GLYPH_CALLBACK_INT32 width, GLYPH_CALLBACK_INT32 height,
+        UINT32 fgcolor, UINT32 bgcolor, BOOL redundant);
 
 /**
  * Called immediately after rendering a series of glyphs. Unlike
@@ -191,7 +210,9 @@ BOOL guac_rdp_glyph_begindraw(rdpContext* context, INT32 x, INT32 y,
  * @return
  *     TRUE if successful, FALSE otherwise.
  */
-BOOL guac_rdp_glyph_enddraw(rdpContext* context, INT32 x, INT32 y,
-        INT32 width, INT32 height, UINT32 fgcolor, UINT32 bgcolor);
+BOOL guac_rdp_glyph_enddraw(rdpContext* context,
+        GLYPH_CALLBACK_INT32 x, GLYPH_CALLBACK_INT32 y,
+        GLYPH_CALLBACK_INT32 width, GLYPH_CALLBACK_INT32 height,
+        UINT32 fgcolor, UINT32 bgcolor);
 
 #endif