1 files changed, 1 insertions, 1 deletions
diff --git a/config.mk b/config.mk
index 8bbdbd1..9fb52f8 100644
--- a/config.mk
+++ b/config.mk
@@ -22,7 +22,7 @@
 CC=cc # C Compiler
 FORCEC99=-std=c99 # Force POSIX C99
 # OPTIMIZE=-O3 # Experimental optimizations (Disabled by default)
-CFLAGS=-I. -Wall -Wextra -g $(FORCEC99) $(OPTIMIZE) # C Compiler flags
+CFLAGS=-D_POSIX_C_SOURCE=200809L -I. -Wall -Wextra -g $(FORCEC99) $(OPTIMIZE) # C Compiler flags
 NOLINKER=-c # C Compiler flag to disable the linker
 # Core utilities
 CORE=\