diff --git a/thirdparty/nodemesh/nodemesh/builder.cpp b/thirdparty/nodemesh/nodemesh/builder.cpp
index 554fd7b0..fa2f747d 100644
--- a/thirdparty/nodemesh/nodemesh/builder.cpp
+++ b/thirdparty/nodemesh/nodemesh/builder.cpp
@@ -283,7 +283,7 @@ bool Builder::validateNormal(const QVector3D &normal)
     if (normal.isNull()) {
         return false;
     }
-    if (isnan(normal.x()) || isnan(normal.y()) || isnan(normal.z())) {
+    if (std::isnan(normal.x()) || std::isnan(normal.y()) || std::isnan(normal.z())) {
         return false;
     }
     return true;
diff --git a/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp b/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp
index 9606e5a7..fcf7eef9 100644
--- a/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp
+++ b/thirdparty/simpleuv/simpleuv/uvunwrapper.cpp
@@ -2,6 +2,7 @@
 #include <unordered_set>
 #include <set>
 #include <queue>
+#include <cmath>
 #include <simpleuv/uvunwrapper.h>
 #include <simpleuv/parametrize.h>
 #include <simpleuv/chartpacker.h>