diff --git a/buildtypes/debug.txt b/buildtypes/debug.txt
index 4033bf6..0d2ac48 100644
--- a/buildtypes/debug.txt
+++ b/buildtypes/debug.txt
@@ -14,4 +14,5 @@
 -Wno-unused
 
 -lreadline
+-lm
 
diff --git a/buildtypes/test-multithreaded.txt b/buildtypes/test-multithreaded.txt
index 58a7fb1..f8d5a50 100644
--- a/buildtypes/test-multithreaded.txt
+++ b/buildtypes/test-multithreaded.txt
@@ -14,4 +14,5 @@
 -Wno-unused
 
 -lreadline
+-lm
 
diff --git a/buildtypes/test.txt b/buildtypes/test.txt
index f73148c..0345d22 100644
--- a/buildtypes/test.txt
+++ b/buildtypes/test.txt
@@ -14,4 +14,5 @@
 -Wno-unused
 
 -lreadline
+-lm