diff --git a/tools/cryptorf/sma.cpp b/tools/cryptorf/sma.cpp
index c1c9b54e3..3fb1da343 100644
--- a/tools/cryptorf/sma.cpp
+++ b/tools/cryptorf/sma.cpp
@@ -32,6 +32,10 @@
 #include "cryptolib.h"
 #include "util.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 using namespace std;
 
 #ifdef _MSC_VER
@@ -852,3 +856,7 @@ int main(int argc, const char *argv[]) {
     }
     return 0;
 }
+
+#if defined(__cplusplus)
+}
+#endif
\ No newline at end of file
diff --git a/tools/cryptorf/sma_multi.cpp b/tools/cryptorf/sma_multi.cpp
index cacaa31d1..91cf97d7c 100644
--- a/tools/cryptorf/sma_multi.cpp
+++ b/tools/cryptorf/sma_multi.cpp
@@ -35,6 +35,10 @@
 #include "cryptolib.h"
 #include "util.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 using namespace std;
 
 #ifdef _MSC_VER
@@ -1136,3 +1140,7 @@ int main(int argc, const char *argv[]) {
     }
     return 0;
 }
+
+#if defined(__cplusplus)
+}
+#endif
\ No newline at end of file