diff --git a/kstars/fitsviewer/fitscentroiddetector.cpp b/kstars/fitsviewer/fitscentroiddetector.cpp
--- a/kstars/fitsviewer/fitscentroiddetector.cpp
+++ b/kstars/fitsviewer/fitscentroiddetector.cpp
@@ -18,6 +18,7 @@
  ***************************************************************************/
 
 #include <math.h>
+#include <cmath>
 
 #include "fitscentroiddetector.h"
 #include "fits_debug.h"
diff --git a/kstars/fitsviewer/fitsgradientdetector.cpp b/kstars/fitsviewer/fitsgradientdetector.cpp
--- a/kstars/fitsviewer/fitsgradientdetector.cpp
+++ b/kstars/fitsviewer/fitsgradientdetector.cpp
@@ -18,6 +18,7 @@
  ***************************************************************************/
 
 #include <math.h>
+#include <cmath>
 
 #include "fits_debug.h"
 #include "fitsgradientdetector.h"
diff --git a/kstars/fitsviewer/fitsthresholddetector.cpp b/kstars/fitsviewer/fitsthresholddetector.cpp
--- a/kstars/fitsviewer/fitsthresholddetector.cpp
+++ b/kstars/fitsviewer/fitsthresholddetector.cpp
@@ -18,6 +18,7 @@
  ***************************************************************************/
 
 #include <math.h>
+#include <cmath>
 
 #include "fits_debug.h"
 #include "fitsthresholddetector.h"