diff --git a/cpp/core/src/zxing/multi/qrcode/detector/MultiFinderPatternFinder.cpp b/cpp/core/src/zxing/multi/qrcode/detector/MultiFinderPatternFinder.cpp
index 6ebeb3696..3ab84c782 100644
--- a/cpp/core/src/zxing/multi/qrcode/detector/MultiFinderPatternFinder.cpp
+++ b/cpp/core/src/zxing/multi/qrcode/detector/MultiFinderPatternFinder.cpp
@@ -15,7 +15,7 @@
  */
 
 #include <algorithm>
-#include <math.h>
+#include <cmath>
 #include <stdlib.h>
 #include <zxing/multi/qrcode/detector/MultiFinderPatternFinder.h>
 #include <zxing/DecodeHints.h>
@@ -171,7 +171,7 @@ std::vector<std::vector<Ref<FinderPattern> > > MultiFinderPatternFinder::selectB
       Ref<FinderPattern> p2 = possibleCenters[i2];
       // Compare the expected module sizes; if they are really off, skip
       float vModSize12 = (p1->getEstimatedModuleSize() - p2->getEstimatedModuleSize()) / std::min(p1->getEstimatedModuleSize(), p2->getEstimatedModuleSize());
-      float vModSize12A = fabs(p1->getEstimatedModuleSize() - p2->getEstimatedModuleSize());
+      float vModSize12A = abs(p1->getEstimatedModuleSize() - p2->getEstimatedModuleSize());
       if (vModSize12A > DIFF_MODSIZE_CUTOFF && vModSize12 >= DIFF_MODSIZE_CUTOFF_PERCENT) {
         // break, since elements are ordered by the module size deviation there cannot be
         // any more interesting elements for the given p1.
@@ -181,7 +181,7 @@ std::vector<std::vector<Ref<FinderPattern> > > MultiFinderPatternFinder::selectB
         Ref<FinderPattern> p3 = possibleCenters[i3];
         // Compare the expected module sizes; if they are really off, skip
         float vModSize23 = (p2->getEstimatedModuleSize() - p3->getEstimatedModuleSize()) / std::min(p2->getEstimatedModuleSize(), p3->getEstimatedModuleSize());
-        float vModSize23A = fabs(p2->getEstimatedModuleSize() - p3->getEstimatedModuleSize());
+        float vModSize23A = abs(p2->getEstimatedModuleSize() - p3->getEstimatedModuleSize());
         if (vModSize23A > DIFF_MODSIZE_CUTOFF && vModSize23 >= DIFF_MODSIZE_CUTOFF_PERCENT) {
           // break, since elements are ordered by the module size deviation there cannot be
           // any more interesting elements for the given p1.
@@ -203,14 +203,14 @@ std::vector<std::vector<Ref<FinderPattern> > > MultiFinderPatternFinder::selectB
           continue;
         }
         // Calculate the difference of the edge lengths in percent
-        float vABBC = fabs((dA - dB) / std::min(dA, dB));
+        float vABBC = abs((dA - dB) / std::min(dA, dB));
         if (vABBC >= 0.1f) {
           continue;
         }
         // Calculate the diagonal length by assuming a 90° angle at topleft
         float dCpy = (float) sqrt(dA * dA + dB * dB);
         // Compare to the real distance in %
-        float vPyC = fabs((dC - dCpy) / std::min(dC, dCpy));
+        float vPyC = abs((dC - dCpy) / std::min(dC, dCpy));
         if (vPyC >= 0.1f) {
           continue;
         }