diff --git a/blueprints/dev-utils/_unix/m4/m4-1.4.18-20190506.diff b/blueprints/dev-utils/_unix/m4/m4-1.4.18-20190506.diff
new file mode 100644
index 000000000..dbdf8e19f
--- /dev/null
+++ b/blueprints/dev-utils/_unix/m4/m4-1.4.18-20190506.diff
@@ -0,0 +1,12 @@
+diff -Nrub -x '*~' -x '*\.rej' -x '*\.orig' -x '*\.o' -x '*\.pyc' m4-1.4.18.orig/lib/vasnprintf.c m4-1.4.18/lib/vasnprintf.c
+--- m4-1.4.18.orig/lib/vasnprintf.c	2016-12-31 14:54:42.000000000 +0100
++++ m4-1.4.18/lib/vasnprintf.c	2019-05-06 11:06:24.000000000 +0200
+@@ -4858,7 +4858,7 @@
+ #endif
+                   *fbp = dp->conversion;
+ #if USE_SNPRINTF
+-# if !(((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined __UCLIBC__) || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
++# if !defined(__APPLE__) && !(((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined __UCLIBC__) || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
+                 fbp[1] = '%';
+                 fbp[2] = 'n';
+                 fbp[3] = '\0';
diff --git a/blueprints/dev-utils/_unix/m4/m4.py b/blueprints/dev-utils/_unix/m4/m4.py
index f7bd05322..2706227f1 100644
--- a/blueprints/dev-utils/_unix/m4/m4.py
+++ b/blueprints/dev-utils/_unix/m4/m4.py
@@ -1,24 +1,27 @@
 import info
 
 
 class subinfo( info.infoclass ):
     def setTargets( self ):
         for ver in ["1.4.18"]:
             self.targets[ ver ] = f"https://ftp.gnu.org/gnu/m4/m4-{ver}.tar.xz"
             self.targetInstSrc[ ver ] = f"m4-{ver}"
             self.targetInstallPath[ver] = "dev-utils"
 
         self.targetDigests["1.4.18"] = (['f2c1e86ca0a404ff281631bdc8377638992744b175afb806e25871a24a934e07'], CraftHash.HashAlgorithm.SHA256)
         self.description = "GNU M4 is an implementation of the traditional Unix macro processor."
         self.defaultTarget = "1.4.18"
 
+        self.patchToApply["1.4.18"] = [("m4-1.4.18-20190506.diff", 1)]
+        self.patchLevel["1.4.18"] = 1
+
 from Package.AutoToolsPackageBase import *
 
 class Package( AutoToolsPackageBase ):
     def __init__( self ):
         AutoToolsPackageBase.__init__( self )
         self.subinfo.options.configure.autoreconf = False
         self.subinfo.options.configure.args += " --disable-static --enable-shared "
         if CraftCore.compiler.isLinux and CraftCore.compiler.isClang():
              self.subinfo.options.configure.cflags += " --rtlib=compiler-rt"
              self.subinfo.options.configure.cxxflags += " --rtlib=compiler-rt"