diff --git a/src/Platform_unix.cpp b/src/Platform_unix.cpp
index ecccc49ee..c05893072 100644
--- a/src/Platform_unix.cpp
+++ b/src/Platform_unix.cpp
@@ -22,6 +22,7 @@
  */
 
 #include <sched.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/resource.h>
diff --git a/src/Summary.cpp b/src/Summary.cpp
index c6c533419..2d93f4293 100644
--- a/src/Summary.cpp
+++ b/src/Summary.cpp
@@ -23,6 +23,7 @@
 
 
 #include <inttypes.h>
+#include <stdio.h>
 #include <uv.h>
 
 
diff --git a/src/api/ApiState.cpp b/src/api/ApiState.cpp
index bade355a3..0ccb34fe6 100644
--- a/src/api/ApiState.cpp
+++ b/src/api/ApiState.cpp
@@ -21,7 +21,7 @@
  *   along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <cmath>
+#include <math.h>
 #include <string.h>
 #include <uv.h>
 
@@ -53,7 +53,7 @@ extern "C"
 
 static inline double normalize(double d)
 {
-    if (!std::isnormal(d)) {
+    if (!isnormal(d)) {
         return 0.0;
     }
 
diff --git a/src/api/NetworkState.cpp b/src/api/NetworkState.cpp
index 997f52dfc..bae290d04 100644
--- a/src/api/NetworkState.cpp
+++ b/src/api/NetworkState.cpp
@@ -23,6 +23,7 @@
 
 
 #include <algorithm>
+#include <stdio.h>
 #include <string.h>
 #include <uv.h>
 
diff --git a/src/workers/Hashrate.cpp b/src/workers/Hashrate.cpp
index 5c20c247c..bd5b7df6e 100644
--- a/src/workers/Hashrate.cpp
+++ b/src/workers/Hashrate.cpp
@@ -23,8 +23,9 @@
 
 
 #include <chrono>
-#include <cmath>
+#include <math.h>
 #include <memory.h>
+#include <stdio.h>
 
 #include "log/Log.h"
 #include "Options.h"
@@ -33,7 +34,7 @@
 
 inline const char *format(double h, char* buf, size_t size)
 {
-    if (std::isnormal(h)) {
+    if (isnormal(h)) {
         snprintf(buf, size, "%03.1f", h);
         return buf;
     }
@@ -77,7 +78,7 @@ double Hashrate::calc(size_t ms) const
 
     for (int i = 0; i < m_threads; ++i) {
         data = calc(i, ms);
-        if (std::isnormal(data)) {
+        if (isnormal(data)) {
             result += data;
         }
     }
@@ -170,7 +171,7 @@ void Hashrate::stop()
 void Hashrate::updateHighest()
 {
    double highest = calc(ShortInterval);
-   if (std::isnormal(highest) && highest > m_highest) {
+   if (isnormal(highest) && highest > m_highest) {
        m_highest = highest;
    }
 }