diff --git a/src/runtime/c/pgf/db.h b/src/runtime/c/pgf/db.h
index 9c92c6919..af5b0c678 100644
--- a/src/runtime/c/pgf/db.h
+++ b/src/runtime/c/pgf/db.h
@@ -112,8 +112,8 @@ private:
     PGF_INTERNAL_DECL void unregister_process();
 
 
-    void lock(DB_scope_mode m);
-    void unlock();
+    PGF_INTERNAL_DECL void lock(DB_scope_mode m);
+    PGF_INTERNAL_DECL void unlock();
 
     friend class DB_scope;
 };
diff --git a/src/runtime/c/pgf/writer.cxx b/src/runtime/c/pgf/writer.cxx
index 7ad272fdc..55e86fb40 100644
--- a/src/runtime/c/pgf/writer.cxx
+++ b/src/runtime/c/pgf/writer.cxx
@@ -55,7 +55,7 @@ void PgfWriter::write_double(double d)
 	unsigned rawexp;
 	uint64_t mantissa;
 
-	switch (fpclassify(d)) {
+	switch (::fpclassify(d)) {
 	case FP_NAN:
 		rawexp   = 0x7ff;
 		mantissa = 1;