diff --git a/rtengine/CA_correct_RT.cc b/rtengine/CA_correct_RT.cc
index dd7dac228..b43e9177e 100644
--- a/rtengine/CA_correct_RT.cc
+++ b/rtengine/CA_correct_RT.cc
@@ -51,11 +51,11 @@ bool LinEqSolve(int nDim, double* pfMatr, double* pfVect, double* pfSolution)
 
     for(k = 0; k < (nDim - 1); k++) { // base row of matrix
         // search of line with max element
-        fMaxElem = fabsf( pfMatr[k * nDim + k] );
+        fMaxElem = fabs( pfMatr[k * nDim + k] );
         m = k;
 
         for (i = k + 1; i < nDim; i++) {
-            if(fMaxElem < fabsf(pfMatr[i * nDim + k]) ) {
+            if(fMaxElem < fabs(pfMatr[i * nDim + k]) ) {
                 fMaxElem = pfMatr[i * nDim + k];
                 m = i;
             }