--- a/gfan0.5/app_fiberpolytope.cpp
+++ b/gfan0.5/app_fiberpolytope.cpp
@@ -63,7 +63,7 @@
 
 	    /* If the vector configuration B does not have full rank then
 	       change coordinates. */
-	    if(rank(B)!=B.getHeight())
+	    if(rank_(B)!=B.getHeight())
 	      {
 	        FieldMatrix M=integerMatrixToFieldMatrix(B,Q);
 	        M.reduce(false,true);//force integer operations - preserving volume
@@ -83,7 +83,7 @@
 	    log1 debug<<"Done computing restricting cone\n";
 
 	    debug<<B.getRows();
-	    debug<<int(rank(B));
+	    debug<<int(rank_(B));
 
 	    Triangulation2 t(B);
 log1 debug<<"Computing initial triangulation\n";
@@ -143,7 +143,7 @@
 */
     /* If the vector configuration A does not have full rank then
        change coordinates. */
-/*    if(rank(A)!=A.getHeight())
+/*    if(rank_(A)!=A.getHeight())
       {
 	FieldMatrix M=integerMatrixToFieldMatrix(A,Q);
 	M.reduce(false,true);//force integer operations - preserving volume
--- a/gfan0.5/app_secondaryfan.cpp
+++ b/gfan0.5/app_secondaryfan.cpp
@@ -307,7 +307,7 @@
 
     if(scaleOption.getValue())
       {
-	if(rank(A)!=A.getHeight())
+	if(rank_(A)!=A.getHeight())
 	  {
 	    cerr << "The vector configuration must have full rank in order to use the scale option.\n";
 	    assert(0);
@@ -342,7 +342,7 @@
 
     /* If the vector configuration A does not have full rank then
        change coordinates. */
-    if(rank(A)!=A.getHeight())
+    if(rank_(A)!=A.getHeight())
       {
 	FieldMatrix M=integerMatrixToFieldMatrix(A,Q);
 	M.reduce(false,true);//force integer operations - preserving volume
--- a/gfan0.5/matrix.cpp
+++ b/gfan0.5/matrix.cpp
@@ -61,7 +61,7 @@
 
 #include "linalg.h"
 
-int rank(IntegerMatrix const &m)
+int rank_(IntegerMatrix const &m)
 {
   return integerMatrixToFieldMatrix(m,Q).rank();
 }
--- a/gfan0.5/matrix.h
+++ b/gfan0.5/matrix.h
@@ -147,6 +147,6 @@
 
 FloatMatrix integerToFloatMatrix(IntegerMatrix const &m);
 IntegerVector flattenMatrix(IntegerMatrix const &m);
-int rank(IntegerMatrix const &m);
+int rank_(IntegerMatrix const &m);
 
 #endif