diff --git a/src/runtime/c/gu/seq.c b/src/runtime/c/gu/seq.c
index 54c92f4de..2c3d6c3e3 100644
--- a/src/runtime/c/gu/seq.c
+++ b/src/runtime/c/gu/seq.c
@@ -4,7 +4,9 @@
 #include <gu/str.h>
 #include <gu/assert.h>
 #include <stdlib.h>
+#ifdef __MINGW32__
 #include <malloc.h>
+#endif
 
 struct GuSeq {
 	size_t len;
diff --git a/src/runtime/c/gu/string.c b/src/runtime/c/gu/string.c
index 9a1677745..969ac709a 100644
--- a/src/runtime/c/gu/string.c
+++ b/src/runtime/c/gu/string.c
@@ -6,7 +6,9 @@
 #include <gu/utf8.h>
 #include <gu/assert.h>
 #include <stdlib.h>
+#ifdef __MINGW32__
 #include <malloc.h>
+#endif
 
 struct GuStringBuf {
 	GuBuf* buf;
diff --git a/src/runtime/c/pgf/reader.c b/src/runtime/c/pgf/reader.c
index 8163f16ed..7b8ea91bc 100644
--- a/src/runtime/c/pgf/reader.c
+++ b/src/runtime/c/pgf/reader.c
@@ -14,7 +14,9 @@
 #include <gu/utf8.h>
 #include <math.h>
 #include <stdlib.h>
+#ifdef __MINGW32__
 #include <malloc.h>
+#endif
 
 //
 // PgfReader