diff --git a/Pdf4QtLib/sources/pdfcolorconvertor.cpp b/Pdf4QtLib/sources/pdfcolorconvertor.cpp
index ce0d0e0..a85c8d9 100644
--- a/Pdf4QtLib/sources/pdfcolorconvertor.cpp
+++ b/Pdf4QtLib/sources/pdfcolorconvertor.cpp
@@ -19,6 +19,8 @@
 #include "pdfimageconversion.h"
 #include "pdfutils.h"
 
+#include <cmath>
+
 namespace pdf
 {
 
diff --git a/Pdf4QtLib/sources/pdfimageconversion.cpp b/Pdf4QtLib/sources/pdfimageconversion.cpp
index 3990486..56c9952 100644
--- a/Pdf4QtLib/sources/pdfimageconversion.cpp
+++ b/Pdf4QtLib/sources/pdfimageconversion.cpp
@@ -1,5 +1,7 @@
 #include "pdfimageconversion.h"
 
+#include <cmath>
+
 namespace pdf
 {