diff --git a/3rd/dmath/dmath b/3rd/dmath/dmath
index f00cb4c3..7699e353 160000
--- a/3rd/dmath/dmath
+++ b/3rd/dmath/dmath
@@ -1 +1 @@
-Subproject commit f00cb4c3456d335556031c9331427e2ed8d30df3
+Subproject commit 7699e35384a578d9d195a8b15555d2e6ff6a81b3
diff --git a/src/modules/math.c b/src/modules/math.c
index 09b5d590..294350e7 100644
--- a/src/modules/math.c
+++ b/src/modules/math.c
@@ -7,6 +7,12 @@
 
 #include <math.h>
 
+#if PK_ENABLE_DETERMINISM
+    #ifndef _DMATH_H
+        #error "_DMATH_H not defined"
+    #endif
+#endif
+
 #define ONE_ARG_FUNC(name, func)                                                                   \
     static bool math_##name(int argc, py_Ref argv) {                                               \
         PY_CHECK_ARGC(1);                                                                          \