diff --git a/libavcodec/os_support.h b/libavcodec/os_support.h
index 443b41df2a..879bc470dd 100644
--- a/libavcodec/os_support.h
+++ b/libavcodec/os_support.h
@@ -25,7 +25,7 @@
 #if defined(CONFIG_OS2)
 #include <stdlib.h>
 static inline int usleep(unsigned int t) { return _sleep2(t / 1000); }
-static inline float floatf(float f) { return floor(f); }
+static inline float floorf(float f) { return floor(f); }
 static inline int strcasecmp(const char* s1, const char* s2) { return stricmp(s1,s2); }
 #endif