diff --git a/vorbis.pc.in b/vorbis.pc.in
index f5ca77d..50cad9e 100644
--- a/vorbis.pc.in
+++ b/vorbis.pc.in
@@ -10,6 +10,6 @@ Description: vorbis is the primary Ogg Vorbis library
 Version: @VERSION@
 Requires.private: ogg
 Conflicts:
-Libs: -L${libdir} -lvorbis 
-Libs.private: @VORBIS_LIBS@
+Libs: -L${libdir} -lvorbis
+Libs.private: @VORBIS_LIBS@ -lm
 Cflags: -I${includedir}
diff --git a/vorbisenc.pc.in b/vorbisenc.pc.in
index a412b7a..4222daf 100644
--- a/vorbisenc.pc.in
+++ b/vorbisenc.pc.in
@@ -10,5 +10,5 @@ Description: vorbisenc is a library that provides a convenient API for setting u
 Version: @VERSION@
 Requires.private: vorbis
 Conflicts:
-Libs: -L${libdir} -lvorbisenc
+Libs: -L${libdir} -lvorbisenc -lm
 Cflags: -I${includedir}