diff --git a/lal-implicit-conversion-XLALError.patch b/lal-implicit-conversion-XLALError.patch
new file mode 100644
index 0000000..755e667
--- /dev/null
+++ b/lal-implicit-conversion-XLALError.patch
@@ -0,0 +1,13 @@
+Index: lal-6.22.0/lib/std/XLALError.h
+===================================================================
+--- lal-6.22.0.orig/lib/std/XLALError.h
++++ lal-6.22.0/lib/std/XLALError.h
+@@ -698,7 +698,7 @@ void XLALError(const char *func,
+  * <li> \b ...     (Optional) Additional arguments for printf-like format.
+  * </ul>
+  */
+-#define XLAL_ERROR(...) _XLAL_ERROR_IMPL_(return XLAL_FAILURE, __VA_ARGS__)
++#define XLAL_ERROR(...) _XLAL_ERROR_IMPL_(return (LALTYPECODE)XLAL_FAILURE, __VA_ARGS__)
+ 
+ /**
+  * Macro to invoke a failure from a XLAL routine returning a pointer.
diff --git a/lal.changes b/lal.changes
index d86b7fd..988bdd9 100644
--- a/lal.changes
+++ b/lal.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sat Jun  6 12:09:59 UTC 2020 - Atri Bhattacharya <badshah400@gmail.com>
+
+- Add lal-implicit-conversion-XLALError.patch to fix an implicit
+  conversion error flagged by GCC 10.
+
 -------------------------------------------------------------------
 Fri May 15 13:07:39 UTC 2020 - Atri Bhattacharya <badshah400@gmail.com>
 
diff --git a/lal.spec b/lal.spec
index f307608..41107c6 100644
--- a/lal.spec
+++ b/lal.spec
@@ -25,6 +25,8 @@ License:        GPL-2.0-only
 Group:          Productivity/Scientific/Physics
 URL:            https://wiki.ligo.org/Computing/DASWG/LALSuite
 Source:         http://software.ligo.org/lscsoft/source/lalsuite/lal-%{version}.tar.xz
+# PATCH-FIX-UPSTREAM lal-implicit-conversion-XLALError.patch badshah400@gmail.com -- Fix an implicit coversion issue flagged by GCC 10
+Patch0:         lal-implicit-conversion-XLALError.patch
 BuildRequires:  %{python_module devel}
 BuildRequires:  %{python_module lscsoft-glue}
 BuildRequires:  %{python_module numpy-devel}